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special chemical molecules that transmit nerve impulses across a synapse.
a relatively small, similar building block of larger molecules (polymers).
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...