Which of the following is a synthetic material?
a. wood
b. plastic
c. wool
d. coal

Your answer is B) Plastic.

Explanation:

"Synthetic" just means "human-made" or "artificial".

A), C), and D) can all be found in nature, and aren't made by humans.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

but there is no

i guess you forgot putting it.