basic source of magnetism is a) charged particles alone b)Movement of charged particles c) Magnetic dipoles d)magnetic domains ​

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life