Living plants may be valuable additions to science classrooms. Which is the most important safety consideration when planning to grow plants in a classroom? the light required for the plants to grow best
the nutrients to feed the plants
the composition of the soil in which to grow the plants
the structure and chemical properties of the plants

The structure and chemical properties of the plants.

Explanation:

Not 100% sure. I was also thinking it could be the composition of the soil in which to grow the plants

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.