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an allergic reaction that triggers the immune system causing constriction and inflammation of the respiratory tract resulting in wheezing and breathing difficulties.
tissues that are responsible for the transport of substances within the plant.
blood vessels that transport deoxygenated blood from the heart to the lungs.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...