Tools and instruments used to puncture or invade the skin must be sterilized or designed to be

The tools and instruments used to puncture or invade the skin must be sterilized or designed to be disposable. aThis makes it capable of being thrown away after being used. It is considered to be a single-used material that is used by the medical practitioners in order to prevent sepsis.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.