The same hormone has considerably different effects in different species. The hormone thyroxine in humans stimulates metabolism, but in frogs it induces metamorphosis from tadpole to adult frog. This indicates that
A. metamorphosis is caused by a change in body metabolism.
B. the chemical composition of the hormone is actually slightly different.
C. the origin of the hormone makes a difference in the effect the hormone has on target tissues.
D. the target tissues have evolved different responses.
E. the organisms have absolutely no evolutionary relationship.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with correct word
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