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a viral disease of birds and mammals commonly called the flu.
an antigen preparation that stimulates the immune system to give protection against a particular...
remove starch from the leaves of a plant by preventing photosynthesis from occurring (for a few...
a lateral meristem in the vascular tissue of plants. The vascular cambium is the source of both...
organisms that feed on dead organic matter and thereby release nutrients back into the soil.
(also called an extinction event) the sudden dying out of large number of species over a short...