activate – v. to cause (a chemical reaction or natural process) to begin

environment – n. all surrounding things, conditions and

influences that affect life

grid -  n. a pattern of lines that cross each other to form squares on a piece of paper, a map, etc.

nerve – n. a thin piece of tissue that sends information through the body to and from the brain

position – n. a place; the way of holding the body; the way

a thing is set or placed

positioning – adj. providing information on the location of something


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