Which of the following materials does sound travels faster in? A. Pure water b. salted water c. unpolluted air d. polluted air

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur