Why do some adolescent start taking drugs? How can this be avoided.

List the factors which motivate the youngsters to take alcohol or drugs. How this can be avoided.

Why do some metals occur in native state ?

Why do some metals lose their lustre?

Why do some people use bifocal lenses?

Why Is that once a person starts taking alcohol or drugs. lt Is difficult to get rid of this habit? Discuss it widr your teacher.

Why do we need to take food?