By delivering oxygen to the cells. The circulatory system transports the blood around the body while the respiratory is responsible for creating the oxygen and transporting it to the blood.
I think the water changes the earth's surface by making the flood come which is how earthquake happen and with earthquake happening, the volcano will erupt.
the function of DNA?
Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living things. All known cellular life and some viruses contain DNA. The main role of DNA in the cell is the long-term storage of information
An autotroph is an organism that can make its own food.