Hazards Of Using Plastic Can Someone Please Check My Answers To See If They Are Correct?

Can someone please check my answers to see if they are correct? - hazards of using plastic

If more than one structure there is a chemical formula, is any structure named (3)
1. an isomer.
2. a PTA.
3. Monomer.
4. a polymer.

A polyamide polymer containing C, H, and? (4)
1. O, N, but not
2. N, O, but not
3. yet
4. O and N

Proteins are made of amino acids (2) formed
1. a type of polycondensation
Feedback.
2. None of these
3. with the formation of a peptide bond.
4. Both answers are correct.
5. In more than one type of polymerization
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The biggest risk in the use of plastic in the house
Building materials and furniture, (2 or 5)
they
1. are slippery.
2. Cause cancer.
3. Form toxic gases during combustion.
4. aRe break easily.
5. Poison children who eat them.