Why are predator-prey and herbivore-plant relationships important in shaping communities?

Predator-prey and herbivore-plant relationships are crucial in shaping communities.

Explanation:

It is the predator species in area that checks the number of prey species in a certain geographical area. More the number of predator species in an area less is the number of prey species in the area.

Similarly the geographical location of preys will depend on the geographical location of predators. Preys tend to flee away from the location of predators. Plant-herbivore relation is also similar.

The number of herbivores checks the number of plants in an area. In the absence of herbivores and predators the number of prey species and plants will exceed beyond limit.