Burrowing owls live in prairie dog holes by chasing away the resident prairie do

Question

Burrowing owls live in prairie dog holes by chasing away the resident prairie dogs. This is an example of

predation

mutualism

competition

commensalism

Buffalo herds move along the prairie eating the grass as they go. When they have moved on, the grass regrows more quickly and is a better food source for the herbivores on the prairie. When the buffalo were hunted nearly to extinction, what happened to the other herbivores on the prairie?

population density increased

population density decreased

all herbivores went extinct

there was no impact on the ecosystem when the buffalo disappeared

predation

mutualism

competition

commensalism

Explanation / Answer

1. Competetion

When two organisms struggle for a single thing, which is desired individually, but can not be shared and can be utilized only by one organism, competetion occurs between the organisms.

2. When the buffalo disappeared, there was no impact on the ecosystem. Since the competetion for the grasslands decreases with extinction of buffaloes, other species get sufficient forage. Buffalos only help in fast regrowth, but they are not essential for the growth/dispersion/survival of the grasslands.

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