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Zebra mussel
A small mollusc that can multiply rapidly. They adhere to boats and can clog inlet pipes. They feed on edible fresh water mussels.

Zebra mussel
Word of the day
Upper Mantle >> The upper mantle of the Earth’s crust is partially fluid, and because of this, the lithosphere is broken up into tectonic plates that move. This is also known as the asthenosphere.