What damage can overgrazing cause?

Correct answer: Decrease of grasses and small plants

The direct answer is A: a decrease in grasses and small plants. Overgrazing happens when too many animals eat vegetation repeatedly or when animals remain on the same land for too long. Step by step: animals remove leaves and grass; plants get less time to regrow; trampling damages roots and soil; bare soil is then more easily blown or washed away; finally, plant cover and soil fertility can decline. Option A is correct because grasses and young plants are eaten and damaged first. Option B, immediate expansion of forests, is the opposite of what usually happens because heavy grazing prevents natural regeneration. Option C, formation of evergreen forests, needs suitable warm, wet conditions and cannot be caused by grazing; overgrazing generally reduces vegetation. Option D, formation of marine marshes, is a coastal water-related process, not a normal result of animals grazing on land. The important chain is too many animals, less regrowth, soil damage, and vegetation degradation. Memory cue: overgrazing means more eating than the land can replace.