Answer:
The muscular system helps push air in and out of the respiratory system. The respiratory system has the lungs to deliver air to the muscles
Explanation:
It is bad to litter because that is harming the environment. When you throw out a can, it can harm a animal or several animals. Litter can also sink into the ground (I think) and harm the plants growing.
The correct answer is solute. I'm pretty sure
I think the cytoskeletal protein that helps a cell maintain its shape is actin.
