Explain how models are used in science

In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.

-Rin

i am positive it is c. condensing but i may be wrong

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.