Valid experiments also must have data that are __​

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

this could be newton#'s law of cooling. the cooling curve is exponential

because if the tool that you are using is not balanced it there would be false mass.