Question

__ are very intelligent animals that play a very important role in ecosystem​

Answer 1

Answer:

First up, unsurprisingly, is cetaceans - or for the purpose of this article, (dolphins and whales.) These creatures are supremely intelligent, with some scientists arguing that they are the most intelligent creatures on our planet.

Dolphins play an important role in keeping their environment in balance. They eat other animals – mainly fish and squid – and are themselves a source of food for some sharks and other creatures. Without dolphins, the animals they prey on would increase in number, and their predators wouldn't have as much to eat.

Explanation:

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