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(also called the carina) in birds is an extension of the sternum (breastbone) which runs along the midline of the sternum and extends outwards, perpendicular to the ribs.
(also called secondary meristems) regions of cells capable of dividing to form new cells in the...
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...