Paleozoic marine creatures are now in contemporary sea. What will happen?

Let's suppose Paleozoic marine creatures (Trilobites, early fish, and many else) has appeared in oceans of 2017. What kind of advantages and disadvantages will they have when they compete with modern marine creatures? By the way, to make things simple, these Paleozoic creatures have perfectly adapted to modern climate and atmosphere. The only difference is how they look like and how they struggle for their lives.

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Paleozoic marine creatures are now in contemporary sea. What will happen?

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