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Assertion :- The rate of appearance of new forms is liked to the life cycle or the life span of organisms. Reason :- The organism with short life span have ability to produce more progenies in shorter time and that have chance to more expsure with nature.

Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as

Any species……..A………growthing under unlimited resource conditions can reach enormous population densities can reach enormous population densities in a short time. Darwin showed how even ……B…….growthing animal like elephant could reach enormous numbers in absence of cheack and that characterstics of organism is called C.

A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in aquatic plants like