<span>The human body is organized at different levels, starting with the cell. Cells are organized into tissues, and tissues form organs. Organs are organized into organ systems such as the skeletal and muscular systems.</span>
A quality I would say of a physical substance is hardness
Hey there!:
The half life of a radioactive element is the time interval in which a sample of this element reduces to half. This interval of time is also called the period of disintegrating.As radioactive elements disintegrate, in the course of time, their quantity and activity are reducing and consequently the amount of energy emitted by it, due to radioactivity, is also reduced.
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Magnesium + oxygen = magnesium oxide
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