Question: Choose your answer.

What is the main function of the circulatory system?

OPTIONS:
- secrete enzymes
- digest proteins
- produce hormones
- transport materials
My Answer: transport materials

Question: Choose your answer.

Four students compared the total mass of the products to the total mass of the reactants after performing three trials of the same chemical reaction. Each student concluded that the total mass of the products was slightly less than the total mass of the reactants. Each student proposed a different explanation as follows. Student 1: The reaction converted some of the reactant mass to energy. Student 2: The chemical reaction produced a gas that escaped. Student 3: Some of the mass measurements were made with insufficient precision. Student 4: Heat released during the reaction caused the volume of the products to increase.Which students offered the most reasonable explanations?

OPTIONS:
- Students 1 and 3
- Students 1 and 4
- Students 2 and 3
- Students 2 and 4
My Answer: Students 2 and 3

Question: Choose your answer.

Which type of energy is found in fossil fuels?

OPTIONS:
- chemical
- mechanical
- nuclear
- radiant
My Answer: chemical

Question: Choose your answer.

The average rainfall in Nevada is about 7 inches per year. The most likely reason for the low amount of rainfall is the

OPTIONS:
- high elevations of deserts.
- location north of the equator.
- lack of moisture in the air.
- great distance from the ocean.
My Answer:
lack of moisture in the air.