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a chemical substance found in food that is essential for maintaining life.
symbiosis where one organism lives on another (on the outside of another).
the second biological classification group (taxon) that is divided into phyla (for animals) or...
in plants: the first plant to become established in an area.in plants: the first plant to become...
invisible, short-wave radiation emitted by the sun, which can cause cancer in humans.
when humans construct or alter the genome of an organism.