Q: Answer the following question given this paragraph: Sure we can! If you've ever flown on a jet airplane, you've been in the stratosphere. Airplanes fly in the stratosphere, because there is less friction. They get better gas mileage and so costs are lower. There is also less turbulence, so passengers are happier. Can you identify the bottom of the stratosphere in the photo? It's where the clouds begin. Remember that all weather is in the troposphere. Q: Planes fly in what layer of the atmosphere because there is less friction and turbulence? A: | OPTIONS:
- mesosphere
- ozone layer
- crust
- stratosphere
A: stratosphere

Q: Answer the following question given this paragraph: Q: The chemical used by the ants to weed their garden turns out to be what kind? A: | OPTIONS:
- sulfide acid
- nitric acid
- sealant acid
- formic acid
A: formic acid

Q: Answer the following question given this paragraph: The main function of the cardiovascular system is transporting substances around the body. Figure above shows some of the substances that are transported in the blood. They include hormones, oxygen, nutrients from digested food, and cellular wastes. Transport of all these materials is necessary to maintain homeostasis of the body and life itself. Q: What is the main function of the cardiovascular system? A: | OPTIONS:
- respiration of air
- excretion of food waste
- coordinate bones and muscles
- transporting substances around the body
A: transporting substances around the body

Q: Answer the following question given this paragraph: Figure 8.11 Fractures of the Humerus and Radius Falls or direct blows can result in fractures of the surgical neck or shaft of the humerus. Falls onto the elbow can fracture the distal humerus. A Colles fracture of the distal radius is the most common forearm fracture. Q: Falling onto what joint can fracture the distal humerus? A: | OPTIONS:
- thumb
- knee
- Foot
- elbow
A: elbow