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this muscle 'closes' or bends the joint when it contracts (so the angle between the bones decreases).
an organism that helps to spread a disease, but is not infected with the disease.
undifferentiated and unspecialised actively dividing cells in the growth regions of plants, such...
a viral disease of birds and mammals commonly called the flu.
the process of moving organic material via the phloem sap.
biological, chemical, or physical agent that stimulates a characteristic function or causes a...