Almost all of today's groups of animals evolved from marine creatures alive at the beginning of the

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The Paleozoic era, which lasted from about 541 million years ago to 252 million years ago, saw the emergence and diversification of many of the major groups of animals that are still thriving today. During this era, marine organisms such as trilobites, brachiopods, and early fish evolved and adapted to various environmental conditions, paving the way for the evolution of more complex life forms, including terrestrial animals.

Almost All of Today's Groups of Animals Evolved from Marine