The reason why energy transfer or transformation is not $100 \%$ efficient is due to:

What types of changes are $P$ and $Q$?
$P -$ Transformation in the shape of a compound without breaking bonds.
$Q -$ Transformation where bonds are broken or new bonds are formed.
$P$ and $Q$ are respectively:

Metabolic reactions occurring in a cell are the result of which of the following?

Which of the following is true regarding energy transformation in living cells?

Statement $P$: The various types of biochemical reactions occurring in every cell of a living organism are collectively called metabolism.
Statement $Q$: Growth occurs when the rate of anabolic processes is greater than the rate of catabolic processes.

In living organisms,the amount of free energy in entropy . . . . . . .