Where does the oxygen produced in respiration come from

In the african savanna, more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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.