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The sea otter is an example of a keystone species. What does the term "keystone species" mean?

a) A species with low ecological impact
b) A species with no predators
c) A species that influences the ecosystem profoundly
d) A species that is always at the top of the food chain

Answer :

Final answer:

The term keystone species refers to species that influences the ecosystem profoundly, hence the correct option is c. A species that influences the ecosystem profoundly.

Explanation:

A keystone species is one that has a disproportionately large impact on its environment relative to its abundance. These species play critical roles in maintaining the structure and function of an ecosystem. Removal of a keystone species can lead to significant changes or even collapse of the ecosystem.

In the case of sea otters, for example, their predation on sea urchins helps regulate the population of sea urchins, which in turn prevents overgrazing of kelp forests. Without sea otters, sea urchin populations can explode, leading to the destruction of kelp forests and cascading effects on the entire marine ecosystem. Thus, keystone species profoundly influence ecosystem dynamics and stability.

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