When some birds mature, they migrate long distances to their breeding grounds or to escape harsh weather. A signal

for this type of behavior is often:a.
a conditioned stimulus.
b. day length.
c. negative reinforcement.
d. a sign stimulus.
e. territoriality.


b

Biology & Microbiology

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Which cells mature in the thymus gland?

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When does crossing-over occur?

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Which of the following parts of an amino acid vary among different amino acids?

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