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Muskox populations remain in the Arctic all year, though they migrate to higher elevations in the wi
Alternative forms of surgeries involving the uterus, ovaries, and fallopian tubes. The solid lines i
Only 750 mountain gorillas remain in two tiny forests in East Africa.
If enough vapor is added to the air to saturate it, a precipitation fog forms beneath the cloud
Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid
Water forms spheres of hydration