What would happen in an ecosystem without primary consumers?

The populations of producers would increase.

The populations of omnivores would increase.

The populations of carnivores would increase.

The populations of decomposers would decrease.

I think the correct answer among the choices listed above is the first option. In an ecosystem without primary consumers, t he populations of producers would increase. This is because nothing will eat the the producers or the plants. The plants will only grow and increase.