What is the primary role of the respiratory system in living organisms?

A. to make carbon dioxide

B. to obtain oxygen

C. to use up nitrogen

D. to find hydrogen

Jayden sows pea seeds and watches them grow into seedlings. To better understand photosynthesis, he keeps one pea plant under green light and the other pea plant under yellow light. What would likely be the result in a few days?

A car is traveling south at a speed of 69 miles per hour and then begins traveling west but continues traveling at the same speed. Which of the following has changed? A. velocity B. gravity C. mass D. speed

What does red light deflect the least in prism?

You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 * 10-19 C. Answer in units of µC.

The chemical formula for sodium fluoride is A) Na7F B) NaF C) NaF2 D) NaF7

The waters of a lake will be most layered in which season A. winter B. spring C. summer D. fall

a 160kg space vehicle is traveling along a straight line at a constant speed of 800. meters per second. the magnitude of the net force on the space vehicle is

Two blocks are at the top of a ramp. Block A slides without friction to the bottom, and at the same instant block B drops vertically to the ground. (a) Which block reaches the ground with the greater speed? Explain.

Wood is an example of a fossil fuel. User: The type of energy stored by fossil fuels such as coal is a. kinetic energy. b. mechanical energy. c. chemical potential energy. d. electromagnetic energy. User: An example of a fossil fuel is a. wood. b.

What type of changes does erosion cause? A physical B chemical C electrical D magnetic