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allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and watery eyes.
fats that are liquid at room temperature. They are found in plants.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
organisms whose cells have a true nucleus and true organelles. These structures are not...