Question

What stimulus are animals responding to if they hibernate?

Answer 1

Answer:

a natural sleep cycle id.k

Explanation:

Answer 2

Answer:

Animals respond to Environmental stimulus if they hibernate.

Explanation:

A stimulus is any change in the  environment that affects the activity of an organism or what causes an animal to act in a certain way.

Hibernation is an innate behavior.  It is a resting state that helps animals survive the winter.  

During hibernation a warm-blooded animal like a ground squirrel slows down its heart rate and breathing rate.

Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship.