boundary, c) a limit or border that separates two areas, motion sensor, f) a device that detects movement, inhabitant, b) a person who lives in a place permanently, resident, i) A person who lives in a particular place for an extended period, either permanently or temporarily., adaptable, a) able to change or adjust to new conditions, occupant, e) a person who is inside or using a space at a particular time, manipulate, h) to control or change something skilfully, molecular, d) related to the smallest units of a substance, contaminant, g) a substance that makes something dirty or unsafe.

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