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words that are spelt the same but have different meanings, e.g. We climbed up the river bank to...
a clear glassy material possessing good heat and electrical insulating properties.
the entire group of people or items that researchers want to study.
a description of where people live or how they are spread out around an area
an increase or decrease in the number of individuals in a given population, usually expressed as...
Population inversion occurs when the number of metastable neon atoms outnumbers neon atoms in...