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a prolonged period of low rainfall which has a negative effect on plant, animal and human life.
a molecule that is formed when oxygen and haemoglobin combine chemically.
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...
mostly columnar epithelium with cilia that line the nasal cavity, trachea, bronchi, fallopian...
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...