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the directional growth of a plant in response to light.
the reproductive organs of angiosperms.
special chemical molecules that transmit nerve impulses across a synapse.
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
tissue that consists of more than one type of cell.