Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.  Milo was playing around with water by changing the pH level. If he raised the pH what would happen to the acidity of the solution it would decrease or it would increase?
it would decrease

When a person exercises regularly, and is fit, the heart undergoes certain long-term adaptations. The heart muscle gets stronger, and expels more blood with each contraction.  Rich works out every day. Paul does not work out at all. Whose heart expels more blood per contraction, resulting in lower BPM Rich or Paul?
Rich

Bigger stars produce more energy, so their surfaces are hotter.  Jan is comparing stars, specifically a large star and the smaller Sun. Given the size of each, Jan can tell that the Sun puts out heat that is lesser or greater?
greater

With less ozone in the stratosphere, more UV rays reach the ground.  Carlos knows that there is less ozone in the stratosphere, and goes out on a sunny day. He puts on sunscreen knowing that the UV rays can reach the ground less or more?
more