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unicellular organisms that contain a true nucleus and membrane bound organelles. All protists are aquatic.
the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...
biological classification group (taxon) for plants that are divided into classes.
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...