Which of the following statements are TRUE? 1. Coenzymes are molecules that bind to an enzyme, changing its shape to help the enzyme receive the substrate thus increasing the rate of the reaction.

2. Inhibitors are molecules that bind to an enzyme either changing its shape or blocking the active site thus decreasing the rate of the reaction.

3. Both the above statements.

4. Neither the above statements.

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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.