Why are human beings which look so different from each other in terms of size. Colour and looks are said to be belonging to the same species?

How are the terms 'critical concentration' and 'deficient' different from each other in terms of concentration of an essential element in plants? Can you find the values of 'critical concentration' and 'deficient' for mineral - Fe & Zn.

Two point electric charges of value q and 2q are kept at a distance d apart from each other in air. A third charge Q is to be kept along the same line in such a way that the net force action on q and 2q is zero. Calculate the position of charge Q in terms of q and d.

Cyanobacteria and hetero-trophic bacteria have been clubbed together in Eubacteria of kingdom Monera as perthe "Five Kingdom Classification" even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified? If so, why?

Which of the following statements regarding species interpendence are ture? an interspecific association where one is benefitted and other remains unaffected is called mutualism An interspecific association where both partners device benefit from each other is called commensalism A direct food relation between the two species of animals in whihc one animal kills and feeds on another animals called predation An interspecific relationship where both the partners are benefitted from each other is called symbiosis.

How many different signals can be generated from 6 flags of different colours if each signal makes use of all the flags at a time, placed one below the other?