Can someone me, ?
organic, biological, and nuclear chemistry.

4. a plastic substance is reheated but won't soften enough to be remolded. this substance must be a
a. thermosetting polymer.
b. thermoplastic material.
c. natural polymer.
d. synthetic monomer.

5. vitamins are classified according to
a. their coenzymes.
b. their functions in the body.
c. their solubility in water and fat.
d. their ability to fight disease.