How does biodiversity affect ecosystem stability?

Having a number of different organisms increases the stability of an ecosystem, because a change in the population of one organism will have less effect on the population of an organism that depends on it. In a biodiverse ecosystem, a consumer will have a larger pool of food resources to draw from. If one of those food resources is decreased, the consumer can adjust by eating more of the other types available.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )