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a complex organic substance needed by the body in small amounts for normal growth and development.
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...
can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms...
organelles that only occur in the green parts of plants. They contain the green pigment...