21. Evolution by Natural Selection
Descent with Modification
Problem 4b
Textbook Question
Textbook QuestionNatural selection is sometimes described as 'survival of the fittest.' Which of the following best measures an organism's fitness? a. how many fertile offspring it produces b. how strong it is when pitted against others of its species c. its ability to withstand environmental extremes d. how much food it is able to make or obtain
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