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a genus of the Protozoa consisting of shapeless unicellular organisms that move by means pseudopodia (false feet), which are bulging parts of the cell membrane
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
a relationship between two different organisms, of different species, from which at least one of...
an antigen preparation that stimulates the immune system to give protection against a particular...
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...