Cells acquire and use energy to synthesize,store,degrade,and eliminate substances through chemical reactions called:

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:

The ionization of a sodium atom to produce $Na^+$ is an example of:

The breakdown process is also called:

When is wear and tear experienced in a living organism?

When does an organism experience wear and tear?