Could emigration or immigration have played a major role in determining the size of the reindeer population? Explain. Think about where these reindeer were and whether they could swim that far

Yes.

Explanation:

Yes, emigration or immigration have played a major role in determining the size of the reindeer  population in specific area because immigration is done by the animals in search of food. The animals moves from one region to another in search of food so due to this movement the population of reindeer decreases in that specific area. Reindeer are good swimmers so due to this ability they cross the vast Yukon River which is half mile wide.

i thinking chemical change

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.