The correct answer is phospholipid / lipids.
All of the pairs represent the combination of macromolecules with their basic units.
In the case of lipids, basic building blocks are free fatty acids, not phospholipids. Phospholipids are a class of lipids composed of two hydrophobic fatty acid "tails" and a hydrophilic "head" consisting of a phosphate group which are joined together by a glycerol molecule.
Immunotherapy is a process where diseases are treated through the activation of the immune system. It often treats cancer.
A. a description of a trait or habitat.
I believe the correct answer is true. <span>Scientific concepts can be explained through drawing. By doing so, it would be easier for the people to understand these concepts. Hope this answers the question. Have a nice day.</span>