What is a microbiome?

A microbiome is the community of micro-organisms living together in a particular habitat.

Explanation:

C. All of the animals would eventually run out of food and die.

I chose this answer because herbivores feed off of plants and if the plants died then the herbivores as well will die. Sense Carnivores feeds off of animal flesh. If there's no more herbivores and plants then the carnivores will also die and that's called extinction.