Scientists have discovered gene products, including the hormone ELH, that control all components of egg-laying behavior in Aplysia slugs. This discovery confirms that
A. the egg-laying behavior has absolutely no nervous system involvement.
B. genes can control endocrine gland secretions that control behavior.
C. this slug could avoid being eaten by garter snakes.
D. genes only influence physiology and structure but not behavior.
E. the egg-laying behavior is innate or hardwired into the slug's brain.
Answer: B
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