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tough cartilage that acts as a shock absorber between vertebrae and at the ends of bones in ball-and-socket joints.
an area of land set aside for the dumping of waste.
a molecule that is built up of two or more different elements that are chemically joined...
a graphical representation of the evolutionary relationship between taxonomic groups based on...
blood vessel that supplies the heart muscle with blood.
a viral disease of birds and mammals commonly called the flu.