Question

(i) Many times, we experience dryness in mouth.
(ii) Radioactive pollution is considered most hazardous pollution.
(iii) Now a days, safer vaccines are being produced.​

Answer 1

Answer:

(1)= 1) In our body there is 65-70 percent of water.This proportion is always maintained.

2) sometimes we lose lots of water either through perspiration or due to unavailability of water for a long time.In such situation,we experience dryness in our mouth.

3)Dryness is a natrual feeling which creates urge in us to drink water,thereby the proportion of water in the body is brought back to its normal levels.