Logic of a solution: *Balance is the ability to sense and maintain body position. Another part of the inner ear is used for balance. The inner ear helps with sensing and maintaining body position.*
*(C)*
The original question: *This helps with sensing and maintaining body position:
Options:
- (A) lightheaded
- (B) sweating
- (C) inner ear
- (D) cochlea
- (E) four limbs
- (F) nerves
- (G) Riding a bike
- (H) dizzy*

Logic of a solution: *Specialization occurs when competing species evolve different adaptations. Species is a group of interbreeding individuals. Specialization occurs when competing groups of interbreeding individuals evolve different adaptations.*
*(H)*
The original question: *Specialization occurs when competing groups of interbreeding individuals evolve different what?
Options:
- (A) color of leaves
- (B) fur and fat
- (C) forces
- (D) colors
- (E) frontal zones
- (F) graptolites
- (G) sensory neurons
- (H) adaptations*

Logic of a solution: *Air pollution harms the respiratory and circulatory systems. An example of an air pollution reaction is the production of photochemical smog. Smog harms the respiratory and circulatory systems.*
*(C)*
The original question:
*What affects the respiratory and circulatory systems in the body?
Options:
- (A) HIV
- (B) sulfur
- (C) smog
- (D) stress
- (E) fever
- (F) sweat
- (G) heat
- (H) tar*