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)

Independent variable

Explanation:

In a scientific experiment, the variable that an experimenter varies or controls is called an independent variable. This variable has a direct impact on dependent variable.

In the question, Rachel wants to test how sunlight  impacts plant growth over time. Now as sunlight impacts plant growth this means sunlight is an independent variable whereas the plants are dependent variable as the amounts of sunlight impact the plants. Also Rachel changes/varies or controls the amounts of sunlight to different sets of plants. Hence from the above definition of an independent variable it is clear that sunlight is an independent variable.

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d

united states government;