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the main nitrogenous waste product of protein metabolism.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the...
single-celled floating algae, which provide food for marine animals, such as fish and whales....
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...