Answer:
A. lipids
Explanation:
Lipids is the macromolecule that makes up the majority of the cell membrane.
Answer:
B) Thin platelets with chain folds at the faces
Explanation:
Crystalline polymer is folding together of molecular chain in an ordered way to form lamella. Polymer crystallize after cooling from evaporation of solvent. It affects the properties of the polymer such as thermal property.
Polymer on freezing becomes disorder forming an amorphous solid.
Valves are structures that allow for one-way blood flow through the heart.
