Question

what happens when the livestock grazing on rangelands remove all or most of the grass cover?
soil erosion from wind and water occurs much quicker
it depends on the species of grass
nothing - the grass just grows back
the less rain can reach the soil

Explanation:

Grass cover protects soil by reducing wind and water impact. Removing most or all grass eliminates this protection, accelerating erosion. Other options are incorrect: grass species don't negate erosion risk, grass can't regrow fast enough to prevent harm, and less grass actually lets more rain hit soil directly.

Answer:

soil erosion from wind and water occurs much quicker