Which life function is primarily involved in the conversion of the energy stored in organic molecules to a form directly usable by a cell?
a) absorption
b) circulation
c) digestion
d) respiration

Respiration

Explanation:

Respiration can be defined as the biological process by which the organism breakdown the energy stored in the form of glucose.

The energy in the form of glucose is broken down to be converted into ATP which is a high energy molecule.

Cellular respiration takes place in the presence of oxygen in which the Glucose is broken down and the energy is transformed into ATP and carbon dioxide is released as a by-product of this process.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

a

explanation: