Answer: The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history.
The most <span>likely cause of the differences in the students’ results would be that their test subjects were different people. In science it is very important to have the constants in the experiment remain the same. </span>
The first one is shield, second is composite, third is cinder cone