The theory of natural selection in explaining adaptations is most consistent with

stridor can't collapse a lung.

this is a good question! i'll do some research and come back when i have the answer!

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.