What leads to increase genetic variation in a population

Genetic variation happens when one organism in the population mates with a genetically different organism. Same species, different genetics such as color or height/weight.

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

as a camel goes without food, its hump begins to shrink. its fur prevents the camel from sweating too much.camels store fat in their humps, not water.

there's the proffessional site that will you.