Concerning your heart, that's the circulatory system
Your lungs are the respritaory system
The congress, whenever two thirds of both houses shall redeem it necessary, shall propose amendments to the constitution <span />
Use the pH color scale. It shows acidity level of both acids and bases. You dip one of the pH strips into whatever liquid you choose, and then compare the new color of the pH strip to the colors on the scale. This will tell you the level of acidity. pH scale can be found below. As you can see, the brighter colors are more acidic than the darker and duller colors.
