Descriptions of new species of insects are more likely to contain diagrams of the shape of the male genitalia than head, wing, or leg parts. Why?
A. Arthropods have hard exoskeletons so head, wing, and leg structures can't vary as much.
B. This is the convention or custom of entomology.
C. Radiation damage to genes usually occurs in genitalia.
D. Small changes in the genitalia cause reproductive isolation while a single species can tolerate wider variation in head, wing, and leg morphology.
E. This is where mutations usually express themselves in animals.
Answer: D
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