Mitochondrial Eve Mitochondrial Eve peoples mitochondiral eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial eve Mitochondrial Eve mitochondriale Eva Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Adam and Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Eve Mitochondrial Eve “African Eve” hypothesis “mitochondrial Eve” about 200 thousand years ago Mitochondrial Eve Mitochondrial Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve “Eve” https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve modern biology mitochondrial Eve mtDNA eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Eva mitocondrial Mitochondrial Eve Mitochondrial Eve Evolutionary Eve might contain more truth than tale Mitochondrial Eve en.wikipedia.org one mother http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve kořenem stromu u ženské části populace Mitochondrial Eve mitochondrial eve http://en.wikipedia.org/wiki/Mitochondr ... only_woman http://en.wikipedia.org... Mitochondrial Eve mitochondrial DNA http://en.wikipedia.org... we are all black Mitochondrial Eve mitochondrial eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Mitochondrial Eve Wikipedia article on Mitochondrial Eve 1 Female and mitochondrial ancestry Mitochondrial Eve 6 See also mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve 미토콘드리아 이브 mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve English Mitochondrial Eve Mitochondrial Eve English http://en.wikipedia.org/wiki/Mitochondrial_Eve en.wikipedia.org... Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve recent common female ancestor Mitochondrial Eve English mtDNA Eve Wikipedia article English митохондриската Ева Mitochondrial Eve mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve We Are One People. mitochondrial Eve mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondriale Eva Wikipedia article Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve en:Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve http://en.wikipedia.org... http://en.wikipedia.org/wiki/Mitochondr ... only_woman Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve the mitochondrial DNA https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org... Mitochondrial Eve http://en.wikipedia.org... Mitochondrial Eve fact. Genética de Eva http://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial DNA Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve 2.2 Not a contemporary of "Adam" http://en.wikipedia.org... Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve navigation Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Mitochondrial Eve mitochondrial eve Eve Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Eve mysterious über-mother http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve English Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve “Eve” Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve one single woman in Africa mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve 'Eve mitochondriale", Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondriaal DNA Mitochondrial Eve genetic evidence Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve biologische Eva mysterious über-mother Mitochondrial Eve mitochondrial Eve en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org... Genética de Eva http://en.wikipedia.org/wiki/Mitochondrial_Eve possibly around 180,000 years ago Eve Gene mitochondrial Eve Eve mitochondrial Eve mitochondrial Eve “Mitochondrial Eve kořenem stromu u ženské části populace "Mitochondrial Eve" 'Eve mitochondriale", Mitochondrial Eve Mitochondrial Eve Wikipedia article on Mitochondrial Eve Mitochondrial Eve article Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve most of it (all of it?) comes from your mother From us all life began Mitochondrial Eve Eve Mitochondrial Eve Eve mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial Eve mysterious über-mother quite related https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org... Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve en.wikipedia.org... https://en.wikipedia.org/wiki/Mitochondrial_Eve Wikipedia article Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve about 200 thousand years ago Mitochondrial Eve Eve Gene w:Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve "Eva Mitocondrial" mitochondrial Eve http://en.wikipedia.org... about 200 thousand years ago a woman http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve mitochondrial eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Eve mitochondrial Eve http://en.wikipedia.org... Eva Mitocondrial Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve "Mitochondrial Eve" 미토콘드리아 이브 http://en.wikipedia.org/wiki/Mitochondrial_Eve Eve Mitochondrial Eve http://en.wikipedia.org... Mitochondrial Eve Mitochondrial Eve Cann, Stoneking & Wilson (1987 w:Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve the mitochondrial DNA mitochondrial Eve English mitochondrial Eve w:Mitochondrial Eve Mitochondrial Eve Most Recent Common Ancestor Mitochondrial Eve http://en.wikipedia.org... African "Eve" http://en.wikipedia.org/wiki/Mitochondrial_Eve most recent common ancestor митохондриската Ева Mitochondrial Eve mitochondrial Eve http://en.wikipedia.org... recent common female ancestor Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Wikipedia article Mitochondrial Eve 粒線體夏娃（Mitochondrial Eve） Mitochondrial Eve Μιτοχονδριακή Εύα Mitochondrial Eve Mitochondrial Eve “mitochondrial Eve” mitochondrial eve hypothesis Eve 2.3 Not the most recent ancestor shared by all humans Mitochondrial Eve 7 References Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve 8 Further reading http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve originating http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve most recent common ancestor Mitochondria Eve genetic eve Mitochondrial Eve search Wikipedia article Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve most of it (all of it?) comes from your mother Mitochondrial Eve митохондриската Ева requires 140,000 years of accumulated mutations Wikipedia article http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org... Eve English http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Eva mitocondrial Eve Mitochondrial Eve Mitochondrial Eve Wikipedia article mitochondrial eve a common ancestor Eve Gene Mitochondrial Eve Eve Gene mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Common misconceptions about Mitochondrial Eve Genética de Eva mitochondrial Eve Eve Eve first one Eve Det är vetenskapligt bevisat mitochondrial Eve en.wikipedia.org... one single woman in Africa Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve en.wikipedia.org/wiki/Mitochondrial_Eve Eva mitocondrial Mitochondrial Eve - Wikipedia, the free encyclopedia Mitochondrial Eve modern biology http://en.wikipedia.org/wiki/Mitochondrial_Eve we are all children of Africa Eve http://en.wikipedia.org... mitochondrial eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial clock Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Μιτοχονδριακή Εύα http://en.wikipedia.org/wiki/Mitochondrial_Eve 'Eve mitochondriale", https://en.wikipedia.org/wiki/Mitochondrial_Eve Eve English http://en.wikipedia.org/wiki/Mitochondrial_Eve Μιτοχονδριακή Εύα Mitochondrial Eve's Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Eva http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve w:Mitochondrial Eve Wikipedia article Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Eve Gene http://en.wikipedia.org/wiki/Mitochondrial_Eve one female Mitochondrial Eve Mitochondrial article http://en.wikipedia.org/wiki/Mitochondrial_Eve mt-MRCA wikipedia Mitochondrial Eve "Mitochondrial Eve" Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve "Mitochondrial Eve" Wikipedia Mitochondrial Eve w:Mitochondrial Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve we are all children of Africa Mitochondrial Eve. Most Recent Common Ancestor Mitochondrial Eve Mitochondrial Eve Μιτοχονδριακή Εύα Mitochondrial Eve Mitochondria Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Wikipedia article http://en.wikipedia.org... article Eve English mitochondrial Eve Mitochondrial Eve a single female ancestor from Africa Eve Mitochondrial Eve אישה אחת Mitochondrial Eve mitochondrial Eve mitochondrial Eve Mitochondrial Eve This Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve, /sigh Wikipedia article mitochondriale Eva possibly around 180,000 years ago Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve African "Eve" Eve Mitochondrial Eve Mitochondrial Eve nejmladší společné matky všech lidí https://en.wikipedia.org/wiki/Mitochondrial_Eve Evolutionary Eve Wikipedia article Mitochondrial Eve Mitochondrial Eve “Mitochondrial Eve Mitochondrial Eve "mitochondrial Eve" Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve quite related Mitochondrial Eve Wikipedia http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org... https://en.wikipedia.org/wiki/Mitochondrial_Eve Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve English 粒線體夏娃（Mitochondrial Eve） Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org... mitochondrial Eve Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org... Mitochondrial Eve Mitokondriális Éváról L Mitochondrial Eve Eve Mitochondrial Eve female common ancestor of all living humans Mitochondrial Eve – Wikipedia any argument based on modern human genetic diversity “mitochondrial Eve” http://en.wikipedia.org... Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Μιτοχονδριακή Εύα Mitochondrial Eve Mitochondrial Eve mitochondrial Eve den mitokondriella Eva we are all related Mitochondrial Eve one single woman in Africa Mitochondrial Eve L mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Eve/Adam Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve all came from the same ancestor biologische Eva Mitochondrial Eve African Eve African mother "Mitochondrial Eve" Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondr ... only_woman http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve - Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve scientific proof Eve Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve any argument based on modern human genetic diversity http://en.wikipedia.org... http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve “mitochondrial Eve” Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve en.wikipedia.org... http://en.wikipedia.org... Mitochondrial Eve Eve Mitochondrial Eve mitochondrial eve about 200 thousand years ago http://en.wikipedia.org/wiki/Mitochondrial_Eve en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve “Mitochondrial Eve” Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Evolutionary Eve Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve 4 Nomenclature Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Wikipedia article Mitochondrial one single woman in Africa Mitochondrial Eve Wikipedia Mitochondrial Eve 2.1 Not the only woman en.wikipedia.org... Mitochondrial Eve Mitochondrial Eve - Wikipedia, the free encyclopedia Wikipedia article English Mitochondrial Eve 9 External links Mitochondrial Eve Mitochondrial Eve Wikipedia Eve/Adam quite related w:Mitochondrial Eve "mitochondrial Eve" English MRCA (mtDNA) https://en.wikipedia.org/wiki/Mitochondrial_Eve Eve http://en.wikipedia.org... mt-MRCA Mitochondrial Eve nejmladší společné matky všech lidí https://en.wikipedia.org/wiki/Mitochondrial_Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Eve Gene https://en.wikipedia.org/wiki/Mitochondrial_Eve article mitochondrial Eve mitochondrial Eve http://en.wikipedia.org... mitochondrial Eve Mitochondrial Eve Mitochondrial Eve - Wikipedia, the free encyclopedia 5 In popular science Mitochondrial DNA Mitochondrial Eve hypothesis Eve mitochondrial Eve mitochondriale Eva Wikipedia mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve peoples Mitochondrial Eve mitochondriale Eva mtEve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve mtDNA Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve#No Mitochondrial Eve 2 Common misconceptions Mitochondrial Eve English https://en.wikipedia.org/wiki/Mitochondrial_Eve mitochondrial Eve Mitochondrial Eve mitokondriska Evan mitochondrial Eve Mitochondrial Eve Mitochondrial Eve kivéve Tishkoff et al. (2009 mitochondrial Eve Mitochondrial Eve 3 Implications of dating and placement of Eve Mitochondrial Eve "Mitochondrial Eve" https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitokondriális Éváról http://en.wikipedia.org/wiki/Mitochondrial_Eve en.wikipedia.org/wiki/Mitochondrial_Eve fact. most of it (all of it?) comes from your mother http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve “mitochondrial Eve” Mitochondrial Eve https://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve a common ancestor "Mitochondrial Eve" article Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve's modern biology mitochondrial Eve an African mother mitochondrial Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve - Wikipedia, the free encyclopedia modern biology mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve African Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve Mitochondrial Eve English Mitochondrial Eve Eve Gene Eve Mitochondrial Eve mitochondriaal DNA English en.wikipedia.org... “mitochondrial Eve” Eve Mitochondrial Eve Mitochondrial Eve mitochondrial Eve Mitochondrial Eve Mitochondrial Eve kvinnan Mitochondrial Eve Wikipedia a common ancestor mitochondrial Eve Mitochondrial Eve Mitochondrial Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve http://en.wikipedia.org/wiki/Mitochondrial_Eve the mitochondrial DNA Mitrochondrial Eve: "mitochondrial Eve" Mitokondriyal Havva