When organisms convert forms of energy, what usually results?

All of the energy is converted into a usable form

Explanation:

We know that energy can be converted from one form to another form and the total amount of energy remains constant.Organism use their energy to make their food then this energy is taken out from their bodies and gets mixed with the earth or the environment. As a result when the organism die their energy is converted into fossil fuels later making gas or oil which is also a usable form of energy.

All of the energy is converted into a usable form

Explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.