A population that has been isolated, especially a smaller one, could have a high level of homozygosity and therefore not a lot of genetic variation. Gene flow between such populations can increase the level of heterozygosity, and therefore up genetic variation.
The mass on mars is 38 percent of earth. Ex: dog weighs 100 on earth, and 38 on mars. 38 percent of 150 is 57 :P
Answer:
The answer is, D. Aphotic.