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the movement of respiratory gases across a respiratory surface.
an infectious disease of the digestive system that is characterised by diarrhoeaandbloodinthe...
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
the area that occurs between the high water and low water marks. It is exposed to the air at low...