Mammals have how many characteristics in common? a. 5 c. 7 b. 6 d. 8

A person jogs eight complete laps around a quarter-mile track in a total time of 13.1 minutes A) Calculate the average speed, in m/s B) Calculate the average velocity, in m/s

If a substance besides water is changed from a gas to a liquid and then to a solid, what happens to the particles?

How many states in the world are there?

Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is called a. direct observation. b. mark and recapture. c. population density. d. sampling.

What type of system allows matter and energy to enter and exit? A. Closed B. Open C. Isolated D. Connected

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil