. Prairie dogs are a species whose very presence contributes to the existence of the ecosystem in which it lives. Prairie dogs contribute to the soil and water quality in their plains ecosystem. Their foraging retains water in the soil and forces fresh new grasses to continually grow. Young grasses have more nutrients for species such as bison and elk.

This is an example of
(Points : 2)
An abiotic factor
A producer
A keystone species
None of the above

Question

. Prairie dogs are a species whose very presence contributes to the existence of the ecosystem in which it lives. Prairie dogs contribute to the soil and water quality in their plains ecosystem. Their foraging retains water in the soil and forces fresh new grasses to continually grow. Young grasses have more nutrients for species such as bison and elk.

This is an example of
(Points : 2)
       An abiotic factor
       A producer
       A keystone species
       None of the above