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The Porifera (sponges) are the first organisms to exhibit: a) specialized germ layers, b) amoebacyte cells...

The Porifera (sponges) are the first organisms to exhibit: a) specialized germ layers, b) amoebacyte cells that move through the colony releasing collagen and Calcium Carbonate outside the cell, c) neuromuscular cells, d) a digestive tube, e) Brain cells.

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Answer - b, amoebacyte cells that move through the colony releasing collagen and calcium carbonate outside the cell.

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