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epithelial tissue that lines the inner spaces of the body or organs.
the tube through which urine passes from the bladder to the exterior.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
the destruction of a donated organ by the immune system of the recipient.
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
the main vein that returns deoxygenated blood from the lower parts of the body to the right...