Why are cnidarians not considered coelomates?

Cnidarians are not considered to have coelm ecause they are diploblastic, so they don't have any mesodermic tissue.

just go with your heart buddy

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.