b.
Lipids
c.
proteins
Macromolecules
are a set collection of polymers that composes most of the organic substances
specifically in the organelles of cells. Thus, these organelles use lipids and
proteins in doing cellular activity and keeps them functioning. Observe
nitrogen and carbon, these two entities are called elements that are composed
of atoms. Elements are the basic composition of a substance. Going back,
examples of molecules could be nucleic tides, polypeptides, RNA, protein,
lipids and etc.
