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a condition that develops when a person has an unbalanced diet.
series of interlinked food chains by which energy circulates within an ecosystem.
parenchyma cells that are exposed to light and contain many chloroplasts. Chlorenchyma cells...
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
muscle found only in the heart and forming the muscle wall (myocardium) of the heart.
all the different living organisms on the Earth from the smallest micro-organisms to the largest...