Which two sentences support only the heliocentric model of the solar system and not the geocentric model?
A. The model can explain why planets appear to move backward and make loops in the sky.
B. Venus and Mercury orbit only one object in space and do not have moons.
C. Jupiter has moons, so objects in space can orbit planets other than Earth.
D. The model can explain the motions of the Sun and other stars across the sky.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.