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.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: