Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges ...
The venomous animals unit consists of comprehensive lesson plans, instructional materials, graphic organizers, and more!
Green Matters on MSN
These wolves survived radiation exposure in Chernobyl — and developed a surprising superpower
Roaming in the eerie air of Chernobyl, these wolves are quietly evolving resistance to a radiation which is otherwise toxic ...
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