7. The function of a cell is determined by its . a. size
b. environment
c. activities
d. structure

structure

Explanation:

the structure and function characteristics of different types of cells are determined by the nature of the protein present.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy