In order to maintain equilibrium, it is essential for the internal environment to preserve the blank of the system

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.

the tricuspid valve is present between right atrium and right ventricle

sex cells are usually half's then they find another half and make a fertilize egg