What Is a Sponge?
A sponge is an extremely simple kind of water animal with a soft, elastic skeleton. It has no head, mouth, or brain. Sponges hatch from eggs. The baby sponge attaches...
Read MoreA sponge is an extremely simple kind of water animal with a soft, elastic skeleton. It has no head, mouth, or brain. Sponges hatch from eggs. The baby sponge attaches...
Read MoreThe Super Ball made its big bounce into the world in 1965. An extremely elastic ball known for its high coefficient of restitution. This curiously bouncy ball was...
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