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broad group (taxon) in the biological classification system, which is then divided into kingdoms. Archaea, Bacteria and Eukaryotes are the currently accepted domains.
stage of photosynthesis that does not require light energy to occur.
simple chemical substances needed by the body in relatively small amounts for normal growth and...
when humans construct or alter the genome of an organism.
an endocrine gland attached to the base of the hypothalamus, which secretes hormones that play a...
(also called radioactive dating) a method of measuring the age of fossils based on how much...