What is a keystone species :–
(a) A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community'* organization and survival
(b) A common species that has plentary of biomass, yet has a fairly low impact on the community'* organization
(c) A rare species that has minimal impact on the biomass and on other species in the community
(d) A dominatnt species taht contitutes a large proportion of the biomass and which affects many other species
