Because Earth does not get significant inputs of matter from space, its essentially fixed supply of nutrients must continually be recycled to support life.

O False

O True

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.