In some amphibians, including salamanders, paedomorphosis results from mutations that ____
a. reduce thyroid hormone production only
b. reduce pituitary hormone production only
c. limit the responsiveness of some developmental processes to thyroid hormone concentration only
d. reduce pituitary hormone production, limit the responsiveness of some developmental
processes to pituitary hormone concentration, or both
e. reduce thyroid hormone production, limit the responsiveness of some developmental
processes to thyroid hormone concentration, or both
ANSWER: e
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