The part of the nervous system responsible for ejaculation is the while the system is responsible for erection.

- They may eat only plants

- They may eat plants and animals

- They recycle nutrients back into the environment

Explanation:

The consumers are the organisms that acquire the nutrients by eating other organisms, be it producers or other consumers. The ones that are feeding on the producers are the herbivores, and they are the primary consumers, while the ones that are feeding on other consumers are the carnivores. There are also omnivores, and they are the ones that feed on both producers and other consumers. When the consumers die, they decompose, thus the nutrients from them are recycled back into the environment.