DNA-based

Why are human and chimpanzee DNA 96 percent similar? Please choose the best option.a) Both groups show similarities in their fossil record.b) Humans and chimpanzees share several similar traits such as the use of tools.c) These two species descended from a recent common ancestor.d) Natural selection has favored those particular genes in both humans and chimpanzees.

In 1973, biologist Theodosius Dobzhansky wrote an essay titled "Nothing in Biology Makes Sense Except in the Light of Evolution." Why is evolution so important for understanding biology? B I U !!! III

Origins of Modern Humans Current data suggest that modern humans evolved from archaic humans primarily in East Africa. A 195,000 year old fossil from the Omo 1 site in Ethiopia shows the beginnings of the skull changes that we associate with modern people, including a rounded skull case and possibly a projecting chin. A 160,000 year old skull from the Herto site in the Middle Awash area of Ethiopia also seems to be at the early stages of this transition. It had the rounded skull case but retained the large brow ridges of archaic humans. Somewhat more advanced transitional forms have been found at Laetoli in Tanzania dating to about 120,000 years ago. By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia (Israel) shortly after 100,000 years ago. There is no reliable evidence of modern humans elsewhere in the Old World until 60,000-40,000 years ago, during a short temperate period in the midst of the last ice age.

Some of the mechanisms that help repair wounds or fight off infection can result in cancer when we’re old. Why hasn’t evolution eliminated these processes? Hint: Do conditions of postreproductive age affect natural selection?

If you found the same gene in all organisms you test, what could this suggest about the evolution of this gene in the history of life on earth?  What if a gene is very similar in most species that you study, but quite different in a particular group?  What if it’s present in nearly everything, but the specific sequences vary quite a bit?

Vhy was natural selection controversial to biologists in Darwin's time? It was a cruel and unfair principle as to why species change. B) It went against the religious beliefs of the time. There was no evidence that descent with modification during Darwin's time. He had no explanation for how advantageous traits were passed from parent to offspring.

"evolution is an integrated process" and uses sickle-cell allele as an example. In just 2-3 sentences, trace the various factors that influence evolution based on this example. I just want to know how Darwin, Mendel, gene flow, genetic drift, mutation, recombination and even the environment serve to create evolution. Thank you.