Match the electromagnetic wave with its application. gamma rays
diagnosis of illnesses through medical
8
X-rays
una apn of DNA production in bacteria
and viruses
ultraviolet waves
destruction of cancer cells
Intro
Done

If its history of, then b) because a) implies only present day (now)

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.