Ossification progresses with age.

True

False

Which are forms of nitrogen that are usable by humans

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.