Because during sleep animals can recuperate and gain new strengths so they can tackle the challenges of the new day. Sleeping has protective functions for the brain because it removes toxins that build up during the day. Furthermore, sleep is helpful because the animal can rest during sleep and be ready for each new day.
I believe the answer is tropic level
<span>A substance needed to convert an inactive form of an enzyme to an active form is called a </span>Coenzyme
Migraines are frequent intense aches of the head of neck
that are not caused by another physical disorder. Severe pain may usually be
felt on either one side or both sides of the head. Pain usually is felt in the temples.
Migraine could last for hours or couple of days.
Find a safe place.................