What is a sentence that could explain a result and can be tested?

What must the condition of the alveoli be in order for gas exchange to occur

To heat 1g of water by 1 C requires A) 1 calorie b) 1 Carlorie c) 1 Joule d) 1 watt

Litmus paper is an example of indicator because

Name three ways to make friction work in your favor

When a gun is fired at the shooting range, the gun recoils (moves backward). Explain this using the law of conservation of momentum

What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's apparent backward movement is termed retrograde motion. D.

Why do charges build up in a cloud

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.