Describe two pathogenic helminthes of man.

Give the source of pathogens in the water.

If there are two pathogen virues one with DNA and other with RNA, which would mutate faster and why?

Describe the two main types of semiconductors.

Briefly describe the buccal cavity of man.

Many microbial pathogens enter the gut of humans along with food. Name the physiological barrier that oritects the body from such pathogens.

Three coins are tossed. Describe : two events, which are not mutually exclusive.