Line 1: *Carbon cycles quickly between organisms and the atmosphere. Deforestation also disrupts the Carbon Cycle. Deforestation disrupts the cycle between organisms and the atmosphere.*
*(H)*
Line 2: *What disrupts the cycle between organisms and the atmosphere?
Options:
- (A) burning coal
- (B) Sulfur dioxide
- (C) replanting forests
- (D) solar system
- (E) Greenhouse gasses
- (F) chlorofluorocarbons
- (G) life cycle
- (H) deforestation*

Logic of a solution: *Mutation creates new genetic variation in a gene pool. Most mutations are beneficial to the organism. Most genetic variations in a gene pool are beneficial to organisms.*
*(G)*
The original question: *Most what in a gene pool are beneficial to organisms?
Options:
- (A) resistance activities
- (B) genetic ties
- (C) genetic distractions
- (D) Plant reproduction
- (E) fur and fat
- (F) resistance
- (G) genetic variations
- (H) genetic similarities*

Line 1: *Pneumonia may be caused by an infection or injury of the lungs. Opportunistic infections, such as Pneumocystis carinii pneumonia, begin to occur. Opportunistic infections may be a result of an infection or injury of the lungs.*
*(F)*
Line 2: *After an infection or injury to the lung, what can happen?
Options:
- (A) Destroy crops
- (B) a lot of human deaths
- (C) Plant growth is reduced
- (D) destroying life
- (E) forest is destroyed
- (F) opportunistic infections
- (G) death and devastation
- (H) negative impact*

Logic of a solution: *Bird beaks are generally adapted for the food they eat. Birds eat food that they scavenge. Beaks are adapted for food that is scavenged.*
*(G)*
The original question: *What are beaks adapted to?
Options:
- (A) principals of aerodynamics
- (B) it keeps an organism warm
- (C) Animal survival
- (D) the environment
- (E) the color of the feathers
- (F) how the bird flies
- (G) food that is scavenged
- (H) the call the bird makes*

Line 1: *Migration is a type of movement that changes population size. Birds migrate to escape poor weather and food supply. Escaping poor weather and food supply changes population size.*
*(F)*
Line 2: *Escaping poor weather and food supply changes what?
Options:
- (A) population age
- (B) the environment
- (C) population education
- (D) general preferences
- (E) important habitats
- (F) population size
- (G) movement
- (H) an organism's body*

Line 1: *Lymphocytes are the key cells involved in the immune response. B lymphocytes produce antibodies . The key cells involved in the immune response produce antibodies.*
*(H)*
Line 2:
*The cells that produce antibodies are key in what system?
Options:
- (A) health
- (B) T cells
- (C) vision
- (D) humans
- (E) macrophages
- (F) B cells
- (G) disease
- (H) immune*