Prairie dogs are a species whose very presence contributions to the existence of the ecosystem in which it lives. prairie dogs contribute to the soil and water quantities in their plain ecosystem there for aging retains water in the soil and forces fresh new grassi's to continue growing young grasses have more nutrition for species such as bison and elk. prairie dogs are an example of
a. a keystone species
b. an abiotic factor
c. a producer
i think the answer is c. but i'm not sure. you
i believe this is true. the nervous system is used to us respond to stimuli in our environment. without it, we wouldn't have reflexes and therefore there would be no need for a brain.