Logic of a solution: *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)*
The original question: *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*
Line 1: *Behaviors can be learned through play. Kids imitate adult actions and behaviors. Actions can be learned through play.*
*(D)*
Line 2: *How can an animal learn actions?
Options:
- (A) movement
- (B) Chemical energy
- (C) by fighting
- (D) through play
- (E) by eating
- (F) when they sleep
- (G) stamina
- (H) Riding a bike*
Logic of a solution: *Head hair is especially important in preventing heat loss from the body. Basically, heat is energy. Head hair is especially important in preventing energy loss from the body.*
*(C)*
The original question: *What does head hair prevent the loss of?
Options:
- (A) matter
- (B) chemicals
- (C) energy
- (D) sunlight
- (E) Nutrients
- (F) warmth
- (G) humidity
- (H) sweating*
Line 1: *Mutations may change the structure of a chromosome or just change a single nucleotide. Most mutations are beneficial to the organism. Changing the structure of a chromosome can be beneficial to the organism.*
*(C)*
Line 2: *Changing the structure of a chromosome can be what to an organsim?
Options:
- (A) massive damage
- (B) mechanical
- (C) beneficial
- (D) harm them
- (E) negative
- (F) dangerous
- (G) homogenous
- (H) Damages them*
Logic of a solution: *Mating is generally preceded by courtship. Friendship usually precedes courtship, and courtship, marriage. Friendship often comes before mating.*
*(C)*
The original question: *What often precedes mating?
Options:
- (A) A Greek letter
- (B) competition
- (C) friendship
- (D) birth of a child
- (E) death
- (F) Chemical energy
- (G) pregnancy
- (H) sweating*
Logic of a solution: *Humans have collected and grown mushrooms for food for thousands of years. Mushrooms are also fungi. Humans have collected and grown fungi for food for thousands of years.*
*(B)*
The original question:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
*What have humans collected and grown as food for thousands of years?
Options:
- (A) sunlight
- (B) fungi
- (C) plants
- (D) rocks
- (E) fungus
- (F) salmon
- (G) ferns
- (H) poison*