A, B, and C
A - An ecosystem cannot function without consumers because if there were sheep and foxes the sheep would keep reproducing with no one to keep their population low and would eventually eat all their food. An ecosystem needs to balance consumers, predators, and omnivores
B - Herbivores eat plants only, but usually the carnivores and omnivores eat them as their food and lower their population
C - Yes, consumers are species that consume another. They could be consuming plants or consuming another species
It’s not D or E
D - Ecosystems are made up of different types of species and they’re not made up of one consumer it’s a complex system where everything balances
E - Different ecosystems are made up of different species for example you won’t find fish in a land ecosystem and you won’t find wolves in an underwater ecosystem.