Biology answers many questions, but its main focus

a. how living organisms interact and function.
b. how people and animals interact and live.
c. the animals of the earth and their environment.
d. the history of life on earth.

I think the correct answer from the choices listed above is option A. Biology answers many questions, but its main focus is how living organisms interact and function. Biology is defined as the scientific study of life. It is a very wide and diverse field. 

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for