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blood that has no antigens (blood group O) and can be given to a person with any blood group.
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
long threads of genetic material (DNA and histone) found in the nucleus of a non-dividing cell...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.