Astudent conducts an experiment to see how music affects plant growth. the student obtains four identical plants. each one is potted in the same type of soil and receives the same amount of sunlight and water each day. plant a listens to classical music for three hours each day. plant b listens to rock music for three hours each day. plant c listens to country music for three hours each day. plant d does not listen to any music at all.
13. based on the experiment in the scenario, which visual aid would be most in showing the change in the plants' heights over time?

The correct answer is the kind of music each plant listens to.

Explanation:

A variable refers to any condition or element whose value gets modifies in an experiment. A variable can take place in distinct quantities or types, and three kinds of variable, that is, dependent, independent, and controlled can be witnessed in an experiment. In the experiment mentioned, the kind of music each plant is listening to is the variable.  

It is an independent variable whose value is modifying as it prevails in distinct kinds and it is the one that the student is using to witness its effect on the growth of the plant. In the experiment, this variable that differs also generate distinct effects or outcomes.  

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.