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Organisms that are absolutely critical to the functioning of the food web and without the them the food web could collapse is an keystone species.
One of the most crucial components is known as the "keystone." A keystone species is an animal that keeps the fabric of an ecosystem marine or otherwise together. Ecosystems would seem extremely different without their keystone species. If a keystone species vanished, some ecosystems might not be able to adjust to environmental changes.
That might lead to the ecosystem's demise or might let an invading species take control and drastically change the ecosystem's course. Since the term "keystone species" is not formally defined, experts may disagree about whether plants or animals in a specific environment are deserving of the honor. The concept, according to some wildlife experts, oversimplifies the function of one animal or plant in intricate food webs and environments.
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