My blood carries oxygen to my cells. Every cell in my body needs oxygen in order to live. Bone cells, muscle cells, brain cells---all must have oxygen. Every cell in my body gives off things my...
Dirty air and water kill animals
> Potomac River Fish Fish take water into their gills to breathe. If too much waste material is in the water, the fish are killed. Animals need clean air and water. Many animals cannot breathe...