Question

what is the meaning of biological in these sentences? all humans need air, water, and food to live. but did you know that sleep is a biological need, too? our brains must rest! having to do with living things not able to stay awake not able to think clearly having to do with the whole world

Explanation:

The word "biological" relates to the study of living organisms. Sleep is a need of living - beings (humans in this case), so it is a biological need.

Answer:

having to do with living things