Hummingbirds are

a. heterotherms.
b. endotherms.
c. ectotherms.
d. ectotherms during the day and endotherms at
night.
e. none of these.


Answer: a

Biology & Microbiology

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The above organism is responsible for fish

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The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.

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Emerging viruses arise by

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