Which planet is closest to the sun?

A. Venus

B. Mercury

C. Mars

D. Neptune

The process of water molecules escaping the Earth's surface and entering the atmosphere is known as __________.

A. Condensation

B. Precipitation

C. Evaporation

D. Collection

If two forces act on an object in opposite directions, the force that results is __________.

A. the difference between the two forces

B. the sum of the two forces

C. the product of the two forces

D. the ratio of the two forces

Most cells without a cell wall also lack __________.

A. mitochondria

B. chloroplasts

C. cell membranes

D. vacuoles

The nucleus of an atom consists of __________.

A. protons, which have a positive electrical charge, and neutrons, which have no charge.

B. electrons, which have a positive electrical charge, and neutrons, which have no charge.

C. protons, which have no electrical charge, and neutrons, which have a positive charge.

D. protons (positive charge), electrons (negative charge), and neutrons (no charge).

Cell protoplasm is made up mostly of __________.

A. water

B. oxygen

C. sugar

D. protein

Muscles attach to bone with __________.

A. connective tissue

B. ligaments

C. tendons

D. rubber bands

The instrument used to measure wind speed is __________.

A. barometer

B. anemometer

C. altimeter

D. fanometer

Organisms that eat other organisms are called __________.

A. prey

B. plants

C. predators

D. insects

Which of the following planets, known as gas giants have no rings?

A. Neptune

B. Jupiter

C. Uranus

D. they all have rings