Which of the following is an example of a free-running cycle?
a) A dog that sleeps all night and stays awake all day
b) A cat that wakes at night and sleeps during the day
c) A dog that sleeps and wakes at various times of the day and night
d) A baby that sleeps four hours at a time, then awakens to eat
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Ответ:
A.
Explanation:
Its True because the dog sleep like human
Ответ:
Tundra
Explanation:
Permafrost is a layer just beneath the surface of the ground that never thaws.