About how many years ago did Earth form?

How was Earth's atmosphere likely affected by the development of photosynthesis?

Prokaryotes are unicellular organisms that do not contain

Eukaryote life began ___________ prokaryote life.

Which of the following is evidence for the common origin of all life on Earth?

Why is sexual reproduction critical to the process of evolution?

Why might it be more difficult to find fossilized remains of simple animals?

When did non-avian dinosaurs become extinct?

What event likely led to the extinction of non-avian dinosaurs?

The die-off of non-avian dinosaurs 65 million years ago is an example of a

Rats and opossums are modern examples of __________, which first appeared 200 million years ago.

What is an evolutionary tree diagram?

In an evolutionary tree diagram, which two organisms are least closely related?

Two organisms branch from the same point on an evolutionary tree diagram. The point that they branch from represents a(n)

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