21. Evolution

Which cell structures best reveal evolutionary unity among all living organisms?

Based on evolutionary relationships, which of the following is considered the more likely ancestor to eukaryotic cells?

Why are duplications of chromosomal regions suspected to be especially important to evolution?

Stanley Miller's 1953 experiments supported the hypothesis that:

One group of reptiles, exemplified by the fossil Archaeopteryx, led to the evolution of ________.

Which of the following indicates that all organisms can be traced back to a common ancestry?

What is the primary goal of evolutionary classification in biology?

Which feature is found in the common ancestor of the deuterostomes?

Which of the following observations most strongly supports the common origin of all life on Earth?

What is niche differentiation in the context of evolution and natural selection?

Which of the following processes includes all the others in the context of evolution and natural selection?

In which group of organisms did the vertebrate lung first appear?

Which statement provides the best evidence that two species share a recent common ancestor?

Why did Carl Sagan famously say that 'we are star stuff'?

Why is there more carbon-14 (\(^{14}\)C) in living bones than in once-living ancient bones of the same mass?