How does natural selection lead to emergence of new species?

Answer:

-There is no natural selection without genetic variations; Individuals of the same species/ population show variations/ genetic differences; these variations are caused by genes/ mutations; and arise by chance; and from within the individual;
-Individuals with beneficial variations are better adapted to compete for resources within the environment; hence they survive, reproduce and transmit these variations to their offspring;
-Those individuals with disadvantageous variations are poorly adapted; hence not able to compete favorably hence are eliminated; the gradual accumulation of small variations for generation to generation leads to emergence of new species;

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