Concept:Grazing animals change vegetation mainly because they eat only certain plants, a process called selective grazing.
Explanation:Selective grazing means animals choose to eat the tastier or more nutritious plants first.
They overgraze these preferred plants and leave the less appealing ones untouched.
This allows the unwanted plants to grow more and take over the land.
Over time, the composition of plant species in the area changes.
Thus, the main way grazing animals alter vegetation is through this selective feeding behavior.
Seed dispersal and pollination are not their primary effects, as they mostly consume leaves and grasses, not fruits or flowers.
Answer:C. selective grazing