Answer:
The main ingredient of cells is water. Water is needed to maintain homeostasis. Cells are also made up of macromolecules—nucleic acids, lipids, proteins, carbohydrates. These macromolecules help maintain a cell's structure, help cells communicate with each other, aid in energy storage, etc.
We have polluted it— the air, water and the ground.
Some people have tried to clean up the environment
Saturation I think not 100% sure sorry
C.All living things are made of the same elements
