a) What are keystone species? Explain their importance giving a suitable example.

Keystone species are those species that have a significant impact on the structure and function of their ecosystem. They are vital to maintaining the balance and diversity of the ecosystem, and their removal can have catastrophic effects on the entire ecosystem.

One of the most famous examples of a keystone species is the sea otter. Sea otters are found along the coasts of the Pacific Ocean, and they play a critical role in maintaining the health and diversity of the kelp forest ecosystem. Sea otters feed on sea urchins, _____ ______ _______ _______ ____ _________ ____ ______ _________ _____ ___.
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