Why do plants need both a cell membrane and a cell wall?

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

The diagram shows a chicken embryo and a human embryo

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d