Why is it that we can see blood cells only with a microscope? A) The cells form clumps. B) The cells keep moving about. C) The cells have different shapes. D) The cells are very small in size.

The Sun is the main source responsible for heating the surface of the Earth. Is this true or false? Give reasons to support your position.

Choose all that represent ways that Venus is different than Earth. a. The atmosphere of Earth is thicker than Venus b. Only Earth's atmosphere traps heat c. The atmosphere of Venus is thicker than Earth's. d.

What could result if the liver was not working properly?

A bicycle slows down when the rider applies the brakes. What type of energy transformation is involved in this example? A. kinetic energy into heat energy B. heat energy into potential energy C. potential energy into kinetic energy D.

What kind of valves are used on water mains?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?

Name one process that requires a force in the human body.