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a small, circular opening in the exoskeleton of insects that allows air to enter the insect's body via the trachea.
blood that has no antibodies (blood group AB) and can receive any type of blood.
a complex organic substance needed by the body in small amounts for normal growth and...
the engulfment of food particles with pseudopodia to form a food vacuole inside the cell. This...
the active maintenance of the correct balance of water and solutes in the blood and tissue fluid...
the cavity used for transport purposes. It has one opening to the environment through which...