What is a keystone species?AA rare species that has minimal impact on the biomass and on other species in the community.BA dominant species that constitutes a large proportion of the biomass and which affects many other species.CA species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organisation and survival.DA common species that has plenty of biomass, yet has a fairly low impact on the community's organization.

A keystone species is a species whose presenceMultiple Choiceis the main reason a community exists.provides food for all other species in a community.is an indicator of environmental health.influences the population size of many other species in its community.

What is a keystone species?

Keystone species is defined as…*2 pointsan organism or species that helps define an entire ecosystema species that is not native to a particular area, but arrives and spreads on its ownan organism or species serves as a measure of the environmental conditions that exist in a given locale.an organism friendly to the environment.

What is a keystone species, why are they important to the ecosystem?*

Those species that have a large contribution towards creating and maintaining habitats that support other speciesa.Non-native speciesb.Foundation speciesc.Indicator speciesd.Keystone species