The human circulatory system

• uses air to release energy.

• processes food and eliminates waste.

• moves oxygenated blood throughout the body.

• controls movement of joints.

Compasses work by

• measuring heat in the air.

• reacting to magnetic fields.

• repulsing wave currents.

• magic.

If an atom has one proton and one electron, the atomic number is

• 2.

• 10.

• 5.

• 1.

The element with the lowest atomic number is

• hydrogen.

• helium.

• lithium.

• uranium.

Absolute zero is equivalent to

• 0 degrees Kelvin.

• 0 kelvins.

• -273.15 degrees Kelvin.

• -273.15 kelvins.

A comet’s tail is visible when

• the metal alloys react to the atmospheric change.

• the ice and rock collide.

• the comet is close enough to the sun.

• the comet passes the Kuiper Belt.

What job would you apply for if you wanted to study the life and culture of the past?

• genealogist

• archaeologist

• ecologist

• ichthyologist

Which of the following is true about the classification system of biology?

• Every animal is categorized according to the proper definition.

• Many disagreements occur among scientists about where an organism belongs.

• Every organism belongs to the mammalian classification.

• Every organism belongs to the felidae classification.

What is the term for an element or molecule that results from a chemical reaction?

• reactant

• product

• molecule

• chemical

What causes a blue tail to trail behind a comet?

• Vapors from its nucleus are blown by solar winds.

• Rock in the comet heats up when it gets closer to the sun.

• A comet is made of fire.

• Comets do not have blue tails.