What causes the piston to move in this engine? the crank
the fuel in the tank
heated gases in the chamber
all of the above

Anurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. if the stock bottle is labeled 25 mg/ml and the order is a dose of 11.0 mg , how many milliliters will the nurse draw up in the syringe?

What forms when chemical reactions combine pollution with sunlight?

The minerals found in bones are deposited by living cells called