Recent molecular data from rRNA, and from mtDNA, show that these living agnathans are monophyletic. There are about 100 species. Hagfish are vertebrates but do not have vertebrae. It is believed that they lost their vertebrae during their lifestyle adaptations.
The name Cyclostomata means "round mouths". Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
Chinese people
Chinese people are the various ethnic groups from China, including Taiwan.
The largest of these groups is the Han Chinese. This group is often called "Chinese" or "ethnic Chinese" in English. Large numbers of Han Chinese live in countries other than China. They may make up as much as 19% of the world's population.
Other ethnic groups in China include the Zhuang, Hui, Manchu, and Uyghurs, among many others. The People's Republic of China (PRC) officially recognises 56 ethnic groups. Taiwan (Republic of China, ROC) officially recognises 14 tribes of Taiwanese aborigines. The list of ethnic groups in China includes the major ethnic groups of China (PRC) and Taiwan.
Wonder (R.J. Palacio novel)
Wonder is a children's novel written by R.J. Palacio. "Wonder" was ranked #1 on The New York Times Best Seller list. It was also on the Texas Bluebonnet Award master list.
This novel is about a boy. This is not a normal boy because of the way he looks (Treacher Collins Syndrome) . He has two or three face surgeries per year. He is normally home-schooled but this year is a little different, he is going to middle school.
The book is in the point of view of different people around Auggie's ( the diagnosed one) life.
Alice in Videoland
Alice in Videoland is an electroclash band from Sweden. The band started in 2002. Toril Lindqvist is the singer.
In 2003 the band released their first album "Maiden Voyage" in Sweden. In 2005 they released their second album "Outrageous!". The band was signed by the American record label Storming The Base. In 2008 the band's third album "She's a Machine!" was released. "She's a Machine" was released as the album's first single. In 2010 the band's fourth album "A Million Thoughts and They're All About You" was released.
Molly Meldrum
Ian Alexander "Molly" Meldrum (born 29 January 1943) is an Australian music critic, journalist, record producer and entrepreneur. He is best known for presenting the popular music program "Countdown" (1974–87). His trademark accessory is his Stetson hat which is commonly mistaken for an Akubra.
Meldrum was born in Orbost, Victoria. He is openly gay. In December 2011, he fell from a ladder in his backyard. After being rushed to The Alfred Hospital, he was placed under intensive care in a sedated state and had surgery for his head injuries. As well as the head injuries, he also had a broken shoulder, broken ribs, a punctured lung and cracked vertebrae.
Space debris
Space debris is the collection of useless objects that are in orbit around Earth, for example broken satellites, empty rocket stages, pieces of metal, and many more. Because of how much space debris there is, collisions happen between space debris and sometimes even operational spacecraft, creating more debris.
Since the start of space programs and the launch of Sputnik 1, NORAD has an active list of all known space launches and objects that are in Earth orbit, including waste parts, for example booster rockets. This is the Space Object Catalog.
Kessler Syndrome
Kessler Syndrome (or an ablation cascade) is a thought-up situation made by the NASA scientist Donald J. Kessler in which the amount of space debris in orbit is large enough to cause space collisions to happen often. This would make space mostly unusable for years if it happened at an extreme level.
There is a satellite in orbit that is large and inactive, making it count as space debris, but it is in an orbit with a large amount of space debris. Two known objects get within 200m of it every year. This could cause a lot of space debris, inducing a domino effect with more collisions.
Satellite manufacturers must demonstrate that their satellite can safely destroy itself or boost itself into a higher or lower orbit, known as a graveyard orbit, to avoid keeping unused satellites in common orbits for other satellites.
Egon Bahr
Egon Karl-Heinz Bahr (18 March 1922 – 20 August 2015) was a German SPD politician.
During World War II Bahr was expelled from the Wehrmacht because he was partly of Jewish descent.
After the war he worked as a journalist and a diplomat before entering into politics.
Bahr was promoted by West German Chancellor Willy Brandt to serve as Secretary of the Prime Minister's Office from 1969 until 1972. Between 1972 and 1990 he was an MP in the Bundestag of the Federal Republic of Germany and from 1972 until 1976 was also a Minister of the Federal Government.
Robert Sumner
Robert L. Sumner (August 3, 1922 – December 5, 2016) was an American Christian author, Baptist pastor and evangelist. He was the editor of the fundamentalist newspaper "The Biblical Evangelist".
Sumner was born in Norwich, New York. He studied at Norwich High School and Baptist Bible College & Seminary.
Bijective function
In mathematics, a bijective function or bijection is a function "f" : "A" → "B" that is both an injection and a surjection. This is equivalent to the following statement: for every element "b" in the codomain "B", there is "exactly" one element "a" in the domain "A" such that "f"("a")="b". Another name for bijection is 1-1 correspondence (read "one-to-one correspondence).
The term "bijection" and the related terms "surjection" and "injection" were introduced by Nicholas Bourbaki. In the 1930s, he and a group of other mathematicians published a series of books on modern advanced mathematics.
Formally:
where the element formula_5 is called the image of the element formula_6, and the element formula_6 the pre-image of the element formula_5.
The formal definition can also be interpreted in two ways:
Note: Surjection means minimum one pre-image. Injection means maximum one pre-image. So bijection means exactly one pre-image.
Cardinality is the "number" of elements in a set. The cardinality of "A"={X,Y,Z,W} is 4. This can be written as #"A"=4.
By definition, two sets "A" and "B" have the same cardinality if there is a bijection between the sets. So #"A"=#"B" means there is a bijection from A to B.
Bijections and inverse functions are related to each other, in that a bijection is invertible, can be turned into its inverse function by reversing the arrows.
Formally:
Let "f" : "A" → "B" be a bijection. The inverse function "g" : "B" → "A" is defined by if "f"("a")="b", then "g"("b")="a". (See also Inverse function.)
Note: The notation for the inverse function of "f" is confusing. Namely,
Let "f"("x"):ℝ→ℝ be a real-valued function "y"="f"("x") of a real-valued argument "x". (This means both the input and output are numbers.)
Example: The linear function of a slanted line is a bijection. That is, "y"="ax"+"b" where "a"≠0 is a bijection.
Example: The polynomial function of third degree: "f"("x")="x" is a bijection. Image 2 and image 5 thin yellow curve. Its inverse is the cube root function "f"("x")= ∛"x" and it is also a bijection "f"("x"):ℝ→ℝ. Image 5: thick green curve.
Example: The quadratic function "f"("x") = "x" is not a bijection (from ℝ→ℝ). Image 3. It is not a surjection. It is not an injection. However, we can restrict both its domain and codomain to the set of non-negative numbers (0,+∞) to get an (invertible) bijection (see examples below).
Example: Suppose our function "machine" is "f"("x")="x"².
Let "f"("x"):"A"→"B" where "A" and "B" are subsets of ℝ.
Example: The quadratic function defined on the restricted domain and codomain [0,+∞)
is a bijection. Image 6: thin yellow curve.
Example: The square root function defined on the restricted domain and codomain [0,+∞)