Variation is inherited is one of the four conditions necessary for natural selection to occur in a population
Step-by-step explanation:
Natural selection is a process in which organisms pass on the heritable trait to their offspring and they adapt to the environment leading to evolution.
Natural selection will occur if the large population is there in which a random mutation has occurred and some organisms in the population have inherited varied characters and passed on these useful characters to the progeny.
Natural selection depends on the environment, random mutation and genetic variation.