Point source pollution comes from sources that are

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

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.