Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle.
Neptune's atmosphere, like Jupiter's and Saturn's, is composed primarily of hydrogen and helium, along with traces of hydrocarbons and possibly nitrogen; it contains a higher proportion of ices such as water, ammonia, and methane.
The outer of the planets are made mostly of gases like hydrogen, helium and nitrogen. The Gas Giants-Jupiter and Saturn are composed of mainly hydrogen and helium.The Ice G â¦ iants-Uranus and Neptune are composed of hydrogen and helium but have much more methane and ices. they are all made of liquid, too.