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Trilobites are of particular interest to biologists because they represent close relatives of the earliest chordates....

Trilobites are of particular interest to biologists because they represent

close relatives of the earliest chordates.

a transition between segmented worms and arthropods.

an important group of parasites.

an important group of parasites.

some of the earliest and most successful arthropods in fossil history.

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# Some of the earliest most successful arthropods.

Trilobites are the group of extinct marine arthropods. These are the most successful among all the animals in the ocean existed 300 million years ago.

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