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B
Cockroach
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C
Millipede
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D
Sacculina
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Solution
The correct option is B Trilobites Trilobites were the dominant species during the Cambrian Period, 540 to 490 million years ago. They are a fossil group of extinct marine arthropods that form the class Trilobita. They finally disappeared in the mass extinction at the end of the Permian about 250 million years ago.