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a relationship between two different organisms, of different species, from which at least one of the organisms benefits.
an infectious disease of the digestive system that is characterised by diarrhoeaandbloodinthe...
the site where a nerve impulse is transmitted from one neuron to the next. There is no physical...
part of the skeleton that occurs in the head which supports the structures of the face and forms...
a heart chamber that pumps blood from the heart to the body or lungs.