21. Evolution by Natural Selection
Descent with Modification
Multiple Choice
Multiple ChoiceWhich of the following is a key observation that must be explained in a unifying theory about life?
A
All living things require oxygen to survive.
B
Evolution is based on descent with modification.
C
Earth is very old.
D
Organisms are rarely well suited to their environments.
E
Many basic characteristics are shared by all living things.
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