I need help with number 6

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

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it