A rule or principle that describes what happens in nature is a

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

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.

digestion

it excretes wastes