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Question: An African monkey has a DNA sequence that is 96.66% similar to a human sequence. According to the…

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An African monkey has a DNA sequence that is 96.66% similar to a
human sequence. According to the molecular clock, about how long
ago did the common ancestor for African monkeys and humans
live?

2.5–3 million years ago
5–6 million years ago
13–16 million years ago

17–20 million years ago

Humans and chimpanzees have a common ancestor that lived
approximately 5 million years ago. Scientists have amassed an
impressive collection of fossils for ancestors to modern humans and
placed these ancestors in chronological order to observe the
changes that occurred as these organisms evolved more human-like
characteristics. Which lines of evidence provide the basis for
stating that humans and chimps have a common ancestor that lived
approximately 5 million years ago?

homologous structures in humans and chimps
DNA sequence similarity
changes in bone structure
vestigial structures in humans

Which description applies to a vestigial structure or trait?

It is the result of convergent evolution.
It represents evidence supporting the common descent and
separate types models for modern organisms.
It did not have a necessary function in more ancestral
organisms, but it does in more evolved organisms.

It is a type of homologous trait that is found in diverse
organisms.

Which organisms are most closely related?

Bears and raccoons, which are both in the order Carnivora
Cougar and lynx, which are both in the family Felidae
Bread molds and yeast, which are both in the kingdom Fungi
Woodpeckers and warblers, which are both In the class Aves

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