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a type of nuclear division during which reproductive cells divide to produce gametes. The chromosome number is halved during this process.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
thin layer of living tissue between the xylem and the phloem, which is able to divide to make...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
water-proof, waxy suberin-thickened layer on the radial and transverse cell walls of the...