If the Earth is more than 70% water, then how come the most intelligent life forms are on land?

Can't water be a suitable habitat for intelligent life?

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hunkalove · 61-69, M

Whales and dolphins are smart.

Dobsdobs · 46-50, M

@hunkalove But primates are smarter. And some other land species are also quite intlligent. And in water it's only cetaceans who r intelligent.