Identify the force used on your arm when you walk a dog on a leash and it tries to chase something. Friction
Gravity
Strong pull
Weak push

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.