Which of these cases provides embryological evidence that two species share a common ancestor?

William discovered that two modern-day species have very similar DNA. He concludes that the two species are closely related. What type of evidence did William most likely use to reach his conclusion?

Which of the following is an example of a vestigial structure?

Which of the following pairs is an example of homologous structures?

Analogous structures…

The two types of fossils that are formed in rocks are

A __________ is formed when an organism is buried in sediments and the sediments change into rock.

Sometimes organisms decay and leave a cavity. When the cavity fills with sand or mud and hardens, it is called a

Scientists can measure the actual age of a fossil or rock by a method called

DNA evidence suggests that whales’ and hippos have a common ancestor. According to this evidence, the most recent common ancestor was a(n)

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