Rachel wants to test how sunlight impacts plant growth over time. She will add varying amounts of light to different sets of plants. The sunlight is a(n) * A. Controlled variable B. Independent variable C. Dependent variable This is a science question btw

B. Independent variable

Explanation:

In an experiment, the independent variable is the variable that the experimenter manipulates or changes in order to effect a response in another variable, called the dependent variable.

In this experiment where Rachel adds varying amount of light in order to see how it impacts plant growth over time. The independent variable is the SUNLIGHT because it is what is changed or manipulated by Rachel. The dependent variable is the plant growth.

a. patterns can explain observations.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .