If a red blood cell is 7 x 
 m in size, it means that such a cell is 7 microns or micrometer in size. The unit that completes the sentence will, thus, be microns or micrometer.
According to international system of measurement:
 m = decimeter
 m = centimeter
 m = millimeter
 m = micrometer or micron
 m = nanometer
Thus, a measurement of 7 x 
 m is the same is 7 micons or 7 micrometer. 
More on metric conversion can be found here: brainly.com/question/17767575
 
        
             
        
        
        
Answer-A
The water cycle shows how water moves around earth. 
Ex: Runoffs,precipitation, condensation, evaporation.
-Steel jelly