Solution idea: Hydrogen bonds cause water to expand when it freezes. Deuterium, or heavy hydrogen, is an isotope of hydrogen, or a hydrogen atom with a neutron added. The bonds of that which when heavy is Deuterium cause water to expand when it freezes.
Q: The bonds of that which when heavy is deuterium cause what to expand when it freezes?
Options:
- (A) matter
- (B) rings
- (C) CO 2
- (D) liquids
- (E) gas
- (F) solutes
- (G) cations
- (H) water
A: (H)

Solution idea: Viruses often infect bacteria. Bacteria are normally classified as either 'good' bacteria or 'bad' bacteria. Viruses can infect good and bad types.
Q: How many types can viruses infect?
Options:
- (A) mice
- (B) pigs
- (C) bird
- (D) RNA
- (E) ova
- (F) tiny
- (G) HPV
- (H) Two
A: (H)

Solution idea: Muscles can only contract. Bones work with muscles to perform movement. Contraction enables bones to perform movement.
Q: What enables bones to perform movement?
Options:
- (A) contraction
- (B) Energy
- (C) sensory neurons
- (D) looseness
- (E) Chemical energy
- (F) Vibrates
- (G) fur and fat
- (H) layers of fat
A: (A)

Solution idea: Most people can survive only a few days without water. H20 Bottled water was generally consumed last year. Most people can survive only a few days without H20.

Q: Most people can survive only a few days without what?
Options:
- (A) h2o
- (B) urea
- (C) CO2
- (D) beds
- (E) houses
- (F) air
- (G) NaCl
- (H) H20
A: (H)