Logic of a solution: *Hydrogen bonds cause water to expand when it freezes. Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin. Something that is primarily electrostatic in origin causes water to expand when it freezes.*
*(B)*
The original question: *Something that is primarily electrostatic in origin causes water to expand when it what?
Options:
- (A) heat
- (B) freezes
- (C) a hazard
- (D) boiling
- (E) moves
- (F) reacts
- (G) expelled
- (H) it's state*

Line 1: *Feathers help birds fly and provide insulation. Birds have bodies covered with feathers. Birds bodies are covered to help them fly and provide insulation.*
*(D)*
Line 2: *What is one reason birds have covered bodies?
Options:
- (A) To help them burrow
- (B) They have thick fur
- (C) layers of fat
- (D) To help them fly
- (E) To keep their body heat.
- (F) To attract predators
- (G) with their fur
- (H) To make them heavier*

Logic of a solution: *Plasma cells are activated B cells that secrete antibodies. Antibodies act as warriors. Plasma cells are activated B cells that secrete warriors.*
*(F)*
The original question: *Plasma cells are activated b cells that secrete what?
Options:
- (A) Leptospirosis
- (B) Activated charcoal
- (C) Cellular phone services
- (D) Sweat
- (E) major threat to health
- (F) Warriors of the body.
- (G) Something that causes allergies
- (H) Chemical energy*

Line 1: *Hormones are chemical messengers that control many body functions. Neurotransmitters are chemical messengers in the brain. Hormones and neurotransmitters behave in common ways.*
*(H)*
Line 2: *Neurotransmitters and hormones are what in their function?
Options:
- (A) cells
- (B) organic
- (C) inorganic
- (D) complex
- (E) Vibrates
- (F) warm
- (G) properties
- (H) similar*

Logic of a solution: *Plants are the major producers in terrestrial biomes. Grasses are very distinctive plants. Grass is a producer in terrestrial biomes.*
*(F)*
The original question: *What is a producer in terrestrial biomes?
Options:
- (A) food
- (B) Oak
- (C) mammals
- (D) flowers
- (E) earth
- (F) grass
- (G) Trees
- (H) mushrooms*

Logic of a solution: *Chromosomes contain genes, which code for proteins. Another gene, named BRCA2, has also been identified. Chromosomes contain BRCA2.*
*(E)*
The original question:
*Where is brca2 located?
Options:
- (A) retina
- (B) lungs
- (C) chromatic
- (D) the eyes
- (E) chromosome
- (F) chromography
- (G) chrome
- (H) sensory neurons*