is the process by which genes for traits that aid survival and reproduction are selected over time to allow the species to thrive.

Natural selection

Explanation:

Natural selection can be defined a process of differential survival and reproduction of members of the species as some members of the species have genes which when express are responsible for traits that can aid in the survival of the organism in its environment and also promotes its reproduction. The beneficial traits are passed from one generation to another this is responsible for sustenance of the species. It gives the survival advantage to the members of the species.

that scientist would be robert hooke

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.