Which of the following phrases describes the cycle of activity that an animal has during any 24-hour period? the animal's circadian rhythm

the animal's biological clock

the animal's hibernation period

Explanation:

the answer is your 1st listed choice because every animal, even humans, have this cycle to fall asleep, or hibernate...

doing4points

Explanation:

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

the answer would be   10%