Organisms change over time and adapt in order to survive. this statement reflects the theory of
a.) evolution
b.) photosynthesis

While the above definition describes evolution, photosynthesis is the process organisms use synthesize food: primarily using three variables in the process: sunlight (energy), water, and carbon dioxide (CO2).

Edit: More specifically, Darwin's Theory of Evolution states that organisms change in a series of natural selection.

straight or amphibians are homeothermic to thermal