The falling off of leaves of deciduous trees is helpful to the plant because it

A sample of wet garden soil of known weigh was heated to constant weight. The loss of weight is due to loss of

Assuming that a period of stable population size is followed by a period when natality increases by ten (1O) per cent and immigration increases by twenty (20) percent of population size. The population size will

Which of the following methods does not make water fit for drinking?

Vaccination results in