There is a part A and B

1. NS
2. NS
3. NS
4. NS
5. NS

Both synthetic and natural products are made from natural resources that can be changed by people from the form they were in when found in nature. But synthetic products are processed and changed chemically by people to produce a new substance with different characteristics.
E.g. plastic bags, bottles etc.

Cis the

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.