Scientific experiments are specially designed to test explanations for an observed phenomenon. a student decides to conduct an experiment to determine the effect that the amount of time spent in the sunlight has on the overall growth of a plant. the student will conduct the experiment using two identical plants that will only spend different amounts of time in the sunlight. all other aspects needed for growth will remain identical for each. in the experiment described, what would the amount of water given to each plant be considered?
a.
an observation
b.
a dependent variable
c.
an independent variable
d.
a control or constant
select the best answer from the choices provided
a
b
c
d

D. A control or constant

Explanation:

Because the purpose of the study is to determine the effect of the amount of sunlight on the growth of a plant, all other factors must remain the same to ensure that only the sunlight is the only factor that elicited change, if any, on the growth of the plant.

Control or constants are factors tht are the same for all test subjects. In this case, water would be one of them. If the researcher were to make the amount of water given between the plants, it could affect the growth of the plant making it hard to determine whether sunlight was what affected it.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.