when mutations decrease the number of individuals in an ecosystem when mutations increase the number of individuals in an ecosystem when mutations decrease the number of species in an ecosystem when mutations increase the number of species in an ecosystem
I gave my students this multiple choice question: When do mutations help make an ecosystem more sustainable?

Only one answer is correct among these 4 choices:
- when mutations decrease the number of individuals in an ecosystem
- when mutations increase the number of individuals in an ecosystem
- when mutations decrease the number of species in an ecosystem
- when mutations increase the number of species in an ecosystem

Could you tell me which one is correct?

when mutations increase the number of species in an ecosystem