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a species that helps scientists identify the age of sedimentary rocks.
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
the collection and disposal or recycling of waste materials and the monitoring of waste.
the complete set of alleles (different forms of genes) making up the genetic material of a...