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the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
states that the cell membrane consists of a double layer of phospholipids in association with...
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...
the collection and disposal or recycling of waste materials and the monitoring of waste.