Q.

The phenomenon where individuals of a species exhibit differences in characteristics are called:

1 Adaptation  
2 Evolution  
3 Variation  
4 All of these  

Ans.

(3)

Any difference between cells, individuals, or groups of organisms of any species produced by genetic differences (genotypic variation) or the effect of environmental conditions on the manifestation of genetic potentials is referred to as variation (phenotypic variation).