Not everything that looks like a sponge is a sponge. Covered by the “tunics” that give them their names, outwardly, tunicates resemble sponges and can be hard to tell apart from them. But their internal architecture is much more complex than sponges. IT’S THE “TUNIC” PART OF TUNICS’ ANATOMY THAT GIVES THEM THEIR SUPERFICIAL RESEMBLANCE TO SPONGES. The stiff, cellulose coverings that conceal tunicates’ inner workings may be very different from sponges’ walls of individual
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