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an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
biological classification group (taxon) that is divided into orders.
method or system for grouping different species of organisms.
processes used to create copies of DNA fragments (usually genes), cells or organisms to create...
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
a liquid-filled body cavity formed within the mesoderm of some animals. The cavity occurs...
animals that have a true coelom, which is a fluid-filled body cavity completely lined with...