Line 1: *Head hair is especially important in preventing heat loss from the body. Almost 90 percent of the body's heat loss is from the head. Without hair, 90 percent of the body's heat would be lost.*
*(H)*
Line 2: *What can prevent 90 percent of the body's heat loss?
Options:
- (A) Masks
- (B) fur
- (C) coats
- (D) bald head
- (E) increase body fat
- (F) sweaters
- (G) skin
- (H) hair*

Logic of a solution: *Some viruses can cause cancer. Skin cancer can kill. Some viruses can kill.*
*(H)*
The original question: *Some viruses can what?
Options:
- (A) fret
- (B) harm
- (C) damage
- (D) grow
- (E) expand
- (F) discover
- (G) visit
- (H) kill*

Line 1: *Producers make food from inorganic molecules. Among the small inorganic molecules which are economically attractive are CO and H 2 . Producers make food from CO and H 2.*
*(A)*
Line 2: *What makes food from co and h 2?
Options:
- (A) producers
- (B) carbon atoms
- (C) Most plants
- (D) production lines
- (E) light energy
- (F) trees
- (G) air pockets
- (H) Chlorophyll*

Logic of a solution: *Shivering occurs when many muscles contract a little bit all at once. Another response to cold is shivering. A response to cold occurs when many muscles contract a little at once.*
*(B)*
The original question: *A response to what occurs when many muscles contract a little at once?
Options:
- (A) heat
- (B) cold
- (C) sweat
- (D) pain
- (E) forces
- (F) stress
- (G) comfort
- (H) motion*

Line 1: *Caffeine is a central nervous system stimulant. Stimulants can cause overheating and dehydration. Caffeine can cause dehydration.*
*(G)*
Line 2: *Caffeine can cause
Options:
- (A) congestion
- (B) anemia
- (C) constipation
- (D) sweating
- (E) hives
- (F) energy usage
- (G) dehydration
- (H) heat energy*

Line 1: *Vertebrates are all chordates that have a backbone. Invertebrates are animals who lack a backbone or spinal column. Vertebrates are all chordates that have a spinal column.*
*(G)*
Line 2:
*What do all vertebrates have that invertebrates don't?
Options:
- (A) sensory neurons
- (B) fur and fat
- (C) bones and joints
- (D) a jaw bone
- (E) kinetic energy
- (F) Chemical energy
- (G) a spinal column
- (H) a set of gills*