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2 years ago

9

These are segments of the columnar stem of what fossil echinoderm animal? Each disk is a single crystal of calcium carbonate, an

d in life the animal's living tissue threaded through the hole passing through the stack of disks.

1 answer:

34kurt2 years ago

7 0

Answer:

Crinoids.

Explanation:

These are segments of crinoids.

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