Why is carbon important to organisms

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.