Which of the following contributes to genetic variability within a population?

i. genetic drift
ii. gene flow
iii. mutations
iv. non-random mating

III.mutations

Genetic variation can be defined as genetic differences that occurs within a population. Genetic variations are the differences in DNA segments or genes that occur in a population. The genetic variations makes individuals different from each other at the genetic or genomic level. Mutation is an alteration in the genetic material of an organism. A mutation can occur when the DNA is being copied during replication or because of environmental factors. Mutations contributes to genetic variability within a population.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

i think its white blood cells

i hope this