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stage of photosynthesis that does not require light energy to occur.
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
(also called pith rays) sections of the medulla that occur between the vascular bundles.
produced, growing, living, or occurring naturally in a particular region or environment.
an individual who donates an organ for the purpose of transplanting it into another person in an...