i-Oxygen yaqala yafunyanwa ngo-1772 ngu-Carl Wilhelm Scheele. Kwaza kwalandela uJoseph Priestley naye wayifumana kwiminyaka emibini emva koko waza yena wazisasaza kuqala ezi ndaba engekazisasazi yena uScheele. Le nto yenza okokuba abantu bacinge okokuba nguPriestley owayifumana kuqala i-oxygen. Igama elithi oxygen livela kumagama esiGrike: oxus (acid) naku gennan (ukuvelisa). I-Oxygen iza emhlabeni isuka kuzo zonke iindawo zehlabathi kwi-meteorites. Ikwafumaneka nakwii-minerals nakwizityalo ezikhula emhlabeni nakwezinye ii-planethi.

i-Phytoplankton Template:IPAc-en yingqokolela yee-[[autotrophic] zohlobo lwee-plankton ikwayintsika esisizinda seelwandle, nesamanzi ahlaziyekileyo ngokwee-ecosystems. Eli gama livela kumagama esiGrike athi φυτόν (i-phyton), nelintsingiselo yalo ithetha ""isityalo"", kwane πλαγκτός (i-planktos), intsingiselo yalo ithetha ""isibhaduli"" okanye ""umkhenkethi"". Inkoliso yee-phytoplankton zincinane kakhulu ukuba zingabonwa ngamehlo engancediswa nto. Nangona kunjalo, xa zininzi kakhulu, ezinye iintlobo zazo zingabonakala ngokungathi ngamachaphaza ammabala-bala apha ngaphezulu emanzini ngenxa yobukho be-chlorophyll phakathi kwee-cell zazo nobukho bemibala efunekayo (efana nee-phycobiliproteins okanye ii-xanthophysll) kwezinye iintlobo zezidalwa eziphilayo.

Xa i-solid isibangamanzi, kuthiwa iyanyibilika. Izinto ezingamanzi zibayi-solid ziqothole zibengumkhenkce. Ezinye ii-solid ezifana nomkhenkce owomileyo, ziyakwazi ukutshintsha zibengumoya zingakhange ziqale zibenganzi kuqala. Olo tshintsho ke kuthiwa yi-sublimation.

I-substance okanye into e-nyibilikileyo (iboniswe ngedayi ebomvu kule mizekelo) yaziwa ngokuba sisinyibiliki. Into leyo isinyibiliki sinyibilika kuyo (umzekelo waso kwezi glasi ngamanzi) saziwa ngokuba sisinyibilikisi.

Umzimba sesona siqu sikhulu somthi. Umzimba wogqunywe ngexolo elirhabaxa elilukhuni elikhusela eluwukhuselayo ukuba ungonakali. Amasebe amila apha esiqwini somthi. Anabela ngaphandle emacaleni ukuze amagqabi afumane imitha yelanga.

I-ECG ibonisa i-atrial systole. oku ke kubizwa ngokuba yi-P-wave. Emva koko kwenzeka i-nentricular systole. Oku ke kubizwa ngokuba kuyi-QRS okanye i-QRS-complex. Ikuthiwa yi-complex kuba kukho amaza aziintlobo ezintathu ngokwahlukana kwazo. Iliza eliyi- Q-wave, i-R-wave, kunye ne-S-wave. emva koko i-ECG ibonisa i-ventricular diastole. Le ke ibizwa ngokuba yi-T-wave. I-Atrial diastole yenzeka ngoko nayo. kodwa ayibonakali yahlukene kwi-ventricular diastole.

Kudala bekusithiwa xa kuthunywa umntwana, Hamba mntwanam, ndizakukupha amathumbu esikhwenene. Isikhwenene ibiyintaka enqabe kunene, ingenakufumaneka lula, kananjalo ibingenakubulawa lula, kuba ibiyintaka ebhabhela phezulu kakhulu, kubenzima kakhulu nokuyichana naxa sele igityiselwa ngentonga.Ngoko ke ibinqwenelwa ngabantu bonke le ntaka, ange umntu angakhe angcamle inyama yayo, nokuba ngamathumbu ayo. Nabantwana imbala bebehlala bethenjiswa ngawo kuba bebewanqwenela. Babesithi bakuthunywa batsibe kuba benethemba lokokuba bazakunikwa loo nto imnandi bathenjiswe ngayo. Kuhambe-kwahamba amathumbu esikhwenene abhekisa kwizimuncu-muncu zakwamlungu.