When an object is placed just outside the focal length of a concave mirror, the image is

the assestment will probley apele with cause and effect

d) physical means can be used to separate the components of air.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.