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microscopic canals running longitudinally through compact bone tissue that contain blood vessels, nerves and lymph vessels.
the movement of an organism in response to a one-directional source of light when the stimulus...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
drugs that are used to treat infections caused by bacteria. Many antibiotics are produced by...
cartilage with few collagen fibres and no elastin fibres. It reduces friction in joints,...
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...