What Would Happen If All Animals Went Extinct?

Providing by all animals you include humans and not insects the result would be that the plants would take over as before creating lush forests pollinated by insects.
If the insects where to die as well then the plants would follow suit over time and the world would become a wasteland. Plants convert co2 to oxygen so the planets atmosphere would change. With this in mind evolution over time would start again. Organisms would develop and grow eventually into some type of animal and plant and the whole cycle would start again

Also,we'd all become vegetarians.

If animals went extinct then we would have no zoos pets and other animals.  If animals went extinct we would have a horrible life, beavers won't be able to eat down old trees. Also, we would have no snakes because snakes eat rodents and rodents are animalmals.