A change in species overtime by which descendants come to differ from their ancestors Evolution

Biology

Ecosystem

Ecology

Evolution

Explanation:

hope this helps

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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.