Answer:
It allows material to stay in and prevent outside material from entering
Explanation:
The Sun. It starts off by evaporating, which is done by the sun heating up the water.
It can helps us to keep the human body healthy and continue to discover how to keep it healthy, and what keeps it healthy. The study of biology can lead to discovering how to prevent diseases. In the environment, if something is off, then people can use biology to see what is wrong and how to fix it.
