At different places on earth, depending on elevation, air pressure varies. which of the following reflects air pressure at any point on earth?
a. carbon dioxide levels in the air
b. the weight of the atmosphere
c. the strength of earth's magnetic field
d. moisture (water vapor) in the air

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

What does a numerical subscript following an element in a chemical formula mean?

Which of the following steps is not likely to take place during cellular respiration? (5 points) select one: a. oxygen combines with carbon of simple sugar. b. energy molecule transfers energy to cells. c. simple sugar breaks down. d. energy is used up.