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dietary supplements of live bacteria that are good for human health.
(also called autotrophic organisms) organisms that produce their own organic food, mainly...
the very cold zone in an ocean, dam or a lake, located below the range of effective light...
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...
unicellular organisms that contain a true nucleus and membrane bound organelles. All protists...
coiled nephron tubule which extends from Bowman's capsule to the loop of Henlé.
blood vessels that transport deoxygenated blood from the heart to the lungs.