What would happen to the food web if all plants were removed?

It would eventually break down and there would not be as much diversity. This is because carnivores eat meat, and herbivores eat plants, so since carnivores sometimes eat herbivores, neither would have any food

Explanation:

The removal of the producers would cause the collapse of the entire food web. Primary consumers or herbivores, which feed on producers directly, would die off.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.