Drugs that cause malformation in embryo during pregnancy are called
Tranquillizers
Teratogens
Alcoholic beverages
Nicotin
Which are represented as $H_2L_2$ from given below?
Diseases like dysentery, cholera, typhoid etc., are more common in over crowded human settlements. Why ?
‘Vaccination' was invented by
Malaria is transmitted by ’Anopheles'. This was discovered by