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small pieces of the parent plant grown in plant-tissue culture.
animals that live socially or in colonies and perform certain tasks for the good of the colony...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.