Which of the following represents a physical change?
a. phase changing
b. atoms rearranging
c. bonds breaking
d. bonds forming

A. phase changing.  Physical change is any change in matter that involves the substance going from one physical state to another, and phase change is most commonly used to describe transitions between solid, liquid and gaseous states of matter.

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

Answercan utilize even low wind speed to produce electricity;