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the body system concerned with the digestion and absorption of nutrients.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
the outer most layer of tightly packed modified parenchyma cells in plants.
a ring of muscle that controls the passage of substances through a tube or body opening.
a graphical representation of the evolutionary relationship between taxonomic groups based on...
two species that interact symbiotically in a relationship that is beneficial to both species....