Why should not medicines be taken without consulting doctors?

Why should bio diversity be conserved ?

Why should we breed animals?

Three houses are available in a locality. Three persons apply for the houses. Each applies for one houses without consulting others. The probability that all three apply for the same houses is a. 1//9 b. 2//9 c. 7//9 d. 8//9

X- ray should not be taken often'. Give the reason.

Why should the object be moved at constant velocity when we define potential energy ?

Why should we conserve forests and wild life?