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an infectious disease of the digestive system that is characterised by diarrhoeaandbloodinthe faeces; it is caused by Entamoeba histolytica
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
the blood circuit from the heart to the lungs and back to the heart.
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
animals with two cellular body wall layers: the ectoderm and endoderm.