21. If you are seeing only a single color on someone's shirt, what is happening? *a The color seen is reflected by the shirt.

A. The color seen is refracted by the shirt.
B. The color seen is diffracted by the shirt.
C. The color seen is absorbed by the shirt.

positive reinforcement? ?

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.