Which element has no neutrons?

A. nitrogen

B. hydrogen

C. carbon

D. helium

What structure connects muscle to bone?

A. tendons

B. joints

C. cartilage

D. ligaments

Cold air is __________ than warm air.

A. less dense

B. generally faster

C. more dense

D. lower-pressured

The number of atoms in a molecule of CuS()4 • 51 h is __________.

A. 15

B. 18

C. 21

D. 29

A lens surface that is __________ bulges outward from the lens, while a lens surface that is __________ is depressed into the lens.

A. planar, convex

B. concave, convex

C. convex, concave

D. orthogonal, planar

Via which of the following unoxygenated blood travels to the heart?

A. arteries

B. veins

C. capillaries

D. aorta

The spinal cord is part of the __________.

A. circulatory system

B. nervous system

C. respiratory system

D. digestive system

The top or broadest level of the classification system for living organisms is called __________.

A. class

B. phylum

C. kingdom

D. genus

How many times would an earthquake that is measured 4 on the Richter Scale be stronger than an earthquake that is measured 2?

A. 2 times stronger

B. 4 times stronger

C. 10 times stronger

D. 100 times stronger

Kinetic energy is the energy that __________.

A. is produced by sound waves

B. an object potentially has

C. is possessed by a moving object

D. results from the attraction of two magnets