Which of the following actions causes the deposition of sand at a delta? A. river water slowing as it enters the ocean
B. salt water and fresh water mixing together
C. ocean waves transporting sand toward land
D. ocean water slowing as it reaches the coast

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

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).