How do consumers help the enviorment give a level 4 defintion plz help

I don't know what a level four definition is but:

Consumers regulate the population of other animals in their habitat. This helps ensure that their ecosystem can support the animals living in their habitat.

the answer would be $18.75.

all you have to do is multiply 125 times 0.15 to get your answer

hope this (rate me brainliest ! )