Q: Answer the following question given this paragraph: Magnetism is due to the movement of electrons within atoms of matter. When electrons spin around the nucleus of an atom, it causes the atom to become a tiny magnet, with north and south poles and a magnetic field. In most materials, the electrons orbiting the nuclei of the atoms are arranged in such a way that the materials have no magnetic properties. Also, in most types of matter, the north and south poles of atoms point in all different directions, so overall the matter is not magnetic. Examples of nonmagnetic materials include wood, glass, plastic, paper, copper, and aluminum. These materials are not attracted to magnets and cannot become magnets. Q: Magnetism is due to the movement of what within atoms? A: | OPTIONS:
- neutrons
- protons
- magnetrons
- electrons
A: electrons

Q: Answer the following question given this paragraph: Q: What can exposure to chemical or biological agents cause later in life? A: | OPTIONS:
- adaptation
- spontaneous mutation
- regression
- an acquired immunodeficiency
A: an acquired immunodeficiency

Q: Answer the following question given this paragraph: Air in the troposphere is warmer closer to Earth's surface. Warm air is less dense than cool air, so it rises higher in the troposphere. This starts a convection cell. Convection mixes the air in the troposphere. Rising air is also a main cause of weather. All of Earth's weather takes place in the troposphere. Q: Why does warm air rise higher in the troposphere? A: | OPTIONS:
- it is more dense than cool air
- It contains hydrogen
- it is less flourishing than cool air
- it is less dense than cool air
A: it is less dense than cool air

Q: Answer the following question given this paragraph: Gases mix homogeneously when confined to same container. When several gases are added to a container, the individual gas particles mix freely, forming a homogeneous mixture in which each type of gas is randomly distributed throughout all the available volume. Q: What is formed when different gases are confined to the same container? A: | OPTIONS:
- linear mixture
- particulate mixture
- compact mixture
- homogeneous mixture
A: homogeneous mixture