Soluções para ciências da vida
Sponge Skeleton
Animal, vegetable, or mineral? That was a question people entertained about sponges for thousands of years. Some sponges were hard, with either a limestone or glassy texture; others were soft and squishy. They were obviously alive because they grew branches and reproduced, but they stayed in one place, so people decided that they must be some odd form of plant.
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