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the right and left halves of bilaterally symmetrical organisms are mirror images of each other
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
a fine thread-like structure. In plants: the stalk of the male sexual organ.
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
a lateral meristem in the vascular tissue of plants. The vascular cambium is the source of both...