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Making the world better, one answer at a time. Cnidarians are important in balancing the ecosystem, as all other organisms are. If there were a decrease in numbers, other living things which rely on cnidarians would also have problems.For example, when a jellyfish kills a fish for food, it is actually helping the other populations of fish that would need to compete with the one slain for food, territory, etc.es, many species of cnidarians have powerful stinging cells and potent venom strong enough to cause injury and or death to humans. These include the Portuguese man of war, th â¦ e sea wasp, lion's mane jellyfish, fire coral, and the carpet sea anemone.
*Reefs are very stable, and provide a protective barrier around many islands and coasts. Without the reefs these islands and coasts will erode away into the ocean. *It is important to protect the reefs we have today, because they can't be replaced. Reefs are formed very slowly by tiny animals called coral.Each animal is tinier than your pinky nail, and grows very slowly, only about 1 centimeter a year.hey are important to the biosphere because they provide a home for the animals and microscopic beings that inhabit the reefs. This is why we should work our hardest to suppor â¦ t and save the reefs. READING IS IMPORTANT.