First off, you must realize that the phase changes are marked by the points B and D on the graph. They are level because all of the energy (or heat) being added is being consumed by the physical process. So The temperature is increasing before the phase change, and after the phase change. The moments before and after are represented by points A, C, and E.
Couple examples of protists are Quartan Malaria, Plasmodium Falciparum, and Babesia Canis
The answer is Air and Gravity
