Question

how is vegetation useful to us?

Answer 1

Vegetation serves several critical functions in the biosphere, at all possible spatial scales. ... Vegetationis also critically important to the world economy, particularly in the use of fossil fuels as an energy source, but also in the global production of food, wood, fuel and other materials.

Answer 2

it is useful in many ways it give us protein minerals and allow to our body to fight with disease and with gems