overgrazing eutrophication invasion by non-native species overproduction of greenhouse gases
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Lions tend to prey on primary consumers like zebras and gazelles. If there were a sudden decline in a population of lions, which ecological imbalance would most likely occur in the habitat?
Possibilities:
- overgrazing
- eutrophication
- invasion by non-native species
- overproduction of greenhouse gases

overgrazing