***HELP*** What is the role of a keystone species?
Limiting the abundance of a competitively dominant species
Populating the ecosystem to decrease diversity
Exploiting the key resources in an ecosystem
Competitively dominant to other organisms in the ecosystem
D. Competitively dominant to other organisms in the ecosystem
A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.