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describes a condition that is present at birth.
a small body of modified cardiac muscle cells in the upper right corner of the wall of the right...
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
breaking down of large nutrient molecules using chemical means (e.g. through the action of...
a measure showing the number of dependents (aged 0-14 and over the age of 65) to the total...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.