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4. In an experiment, suppose that the wings of fruit flies were clipped short for fifty generations.
The fifty­first generation emerged with normal­length wings. This observation would tend to disprove the idea that evolution is based on

A.)inheritance of natural variations.
B.)inheritance of acquired characteristics.
C.)natural selection.
D.)survival of the fittest.


5. Charles Darwin called the ability of an organism to survive and reproduce in its specific environment.

A.)diversity.
B.)fitness.
C.)adaptation.
D.)evolution.