Ascientist designs an experiment to test how the intensity, or strength, of light affects plant growth. which of the following should be consistent among the plants he tests? mark all that apply. the quantity of water given to the plants. the type of soil used for potting the plants. the type of plant used for the test, the length of time the plants are exposed to light.

The length of time the plants are exposed to light.

Explanation:

In an experiment, the independent variable can be modified and intentionally changed so as to observe it's impact over the dependent variable. In a dependent variable the changes occur due to the changes in the independent variable.  

In the given experiment, the intensity, strength are the properties of light which can only affect the growth of the plants when the light is incident over the plant for a considerable time.  Here, the length of time is the independent variable and the growth of plant is the dependent variable.

what bodys are there orbiting?

c is the answer to this question. altitude affects the weather because air molecules evaporate.