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the process whereby certain substances are removed from a liquid and others retained, due to differences in their ability to pass through a semi-permeable membrane. Kidney dialysis is the medical procedure whereby a person's blood can be purified by passing it through a dialysis machine.
the form in which carbon dioxide is transported in red blood cells.
cellular respiration that takes place when free oxygen is absent
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
lasting or continuing throughout the entire year, as a stream.