Logic of a solution: *Sweat wets the skin, and when it evaporates, it cools the body. Perspiration There are about 2 million sweat glands in the average human body. Perspiration wets the skin, and when it evaporates, it cools the body.*
*(G)*
The original question: *What wets the skin, and when it evaporates, it cools the body?
Options:
- (A) heat energy
- (B) acetic acid
- (C) Air conditioner
- (D) salt and water.
- (E) Skin oil
- (F) water vapor
- (G) Perspiration
- (H) A towel*

Line 1: *Biomass is the total mass of organisms at a trophic level. Most living things are called organisms. Biomass is the total mass of living things at a trophic level.*
*(A)*
Line 2: *Biomass is the total mass of living things at each what?
Options:
- (A) trophic level
- (B) important habitats
- (C) Energy.
- (D) food and shelter
- (E) Power plants
- (F) animals
- (G) body water
- (H) heat energy*

Logic of a solution: *Roundworms may be free-living or parasitic. Roundworms Nearly all puppies and kittens have roundworms. Puppies and kittens may have parasitic worms.*
*(H)*
The original question: *What might puppies and kitties have?
Options:
- (A) They have thick fur
- (B) leeches
- (C) Animal fur
- (D) fur and fat
- (E) sensory neurons
- (F) parasitic snakes
- (G) crickets
- (H) parasitic worms*

Line 1: *Sweating reduces body heat. Sweat is made of salt and water. Saltwater excretion reduces body heat.*
*(H)*
Line 2: *Saltwater excretion reduces what?
Options:
- (A) emissions
- (B) dehydration
- (C) light energy
- (D) bacteria
- (E) sweat
- (F) energy usage
- (G) evaporation
- (H) body heat*

Logic of a solution: *Arthropods have a life cycle with sexual reproduction. Sexual reproduction mixes the genes up more than is possible with asexual reproduction. Arthropods have a life cycle with mixing genes up.*
*(H)*
The original question: *Arthropods have a life cycle with what?
Options:
- (A) rapid expansion
- (B) survival
- (C) aerobic capacity
- (D) food and shelter
- (E) an organism's body
- (F) reproduce
- (G) barnacles
- (H) mixing genes up*

Logic of a solution: *Cancer cells divide more often than normal cells, and grow out of control. Cancer is an example of a mutation in cells. Mutation can cause growth out of control.*
*(H)*
The original question:
*What can mutations cause?
Options:
- (A) death and devastation
- (B) blood
- (C) massive damage
- (D) Leptospirosis
- (E) biological diversity
- (F) horses
- (G) ice
- (H) out of control growth*