A team of researchers discovers a new area of land. The land has a few grasses and weeds growing on it but nothing else. They notice that the soil has a layer of ash and burned bits of wood in it that they think
are about 5 years old. What should the researchers conclude happened about 5 years ago, and why should
they draw that conclusion?

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.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.