Example of physiological barrier.

Cancer cells are more easily damaged by radiation than normal cells because they are

The human liver fluke depends on how many intermediate host or vectors ?

$A$ - Smoking is associated with increased incidence of cancer of lung

$R$ - It increase $CO$ content in blood and reduce the concentration of haembound oxygen

An alkaloid called 'Reserpine' is extracted from

Virus-infected cells secrete proteins called