5) there are currently millions of species of single-celled organisms, and million of others that were once here and are now extinct. which of these would best describe the first, most primitive organism to arise on earth from which all other life evolved? a) unicellular eukaryote b) unicellular prokaryote c) multicellular eukaryote d) multicellular prokaryote

coal is not sustainable because it will one day run out.

light dependent reactions:

light independent reactions:

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the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.