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single-celled algae that have two flagella and are found mainly in seawater but are also common...
animals with two cellular body wall layers: the ectoderm and endoderm.
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.
biological classification group (taxon) for plants that are divided into classes.
broad group (taxon) in the biological classification system, which is then divided into kingdoms...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...