Which of the following types of organisms must use the process of
respiration?

A)Autotrophs
B)Primary consumers
C)Secondary consumers
D)All of the above

D) All of the above.

Explanation:

Respiration is energy releasing process which is the basic requirement of all living organisms. In respiration process, energy is released due to the breakdown of glucose molecules with the addition of oxygen forming carbondioxode, water and energy in the form of Adenine tri phosphate (ATP). Respiration is done in the mitochondria of the cell. This ATP is used by the living organisms in different activities and processes.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.