The substance is required by all living things and is involved in many processes that occur in all living things.
It will ultimately affect every branch of the food chain, as protists are the basis of it all.
HEY MATE......
HERE IS UR ANSWER...
receptor
an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve.
a region of tissue, or a molecule in a cell membrane, which responds specifically to a particular neurotransmitter, hormone, antigen, or other substance.
Eye protection and mindful care with hand acid