Do all organisms rely on the sun for energy

no

Explanation:

because  some plants rely on photosynthesis to survive and they use the suns energy for that but if something does not photosynthesize then it gets energy from food.

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