Which characteristics can be used to differentiate star systems?

in the stars are three main system so I shall say the difference is that they are not in right position

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.