This system gets oxygen to the cells of the body and rids the body of waste gases some organisems use thier skin this is also a cell level process

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

In each transformation of energy , some energy what?

This is a biological reaction due to a stimulus. i need this quickly !