Which of these forces protons and neutrons to stay at the center of the atom?
gravitational force
electromagnetic force
weak nuclear force
strong nuclear force

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d