Biology

The correct answer is A.Keystone Species.

A keystone species is one that has a disproportionately large impact on its ecosystem relative to its abundance or biomass. These species play a crucial role in maintaining the structure and functioning of the ecosystem, and their removal can lead to significant changes or even collapse of the community.

Examples of keystone species include:

1.Sea otters: They control the population of sea urchins, which, if left unchecked, can devastate kelp forests.

2.Wolves in Yellowstone: They regulate populations of herbivores, like elk, which helps maintain the ba...