Question

while the most abundant and dominant species within a particular ecosystem is often crucial in perpetuating the ecosystem, a śkeystone species, here defined as one whose effects are much larger (5) than would be predicted from its abundance, can also play a vital role. but because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic. it might (10) seem that certain traits would clearly define a species as a keystone species; for example,

Answer 1

A population of seals in an Arctic habitat is counted in order to determine whether it is the dominant species in that ecosystem, B. A species of fish that is a keystone species in one marine ecosystem is introduced into another marine ecosystem to see whether the species will come to occupy a keystone role.