Logic of a solution: *Biodiversity generally increases from the poles to the equator. Biodiversity contributes to ecosystem complexity. Ecosystem complexity generally increases from the poles to the equator.*
*(F)*
The original question: *Where is ecosystem complexitiy generally least?
Options:
- (A) humans disturb it
- (B) frontal zones
- (C) in lakes
- (D) at the ocean
- (E) our planet
- (F) at the poles
- (G) mouth of rivers
- (H) at the equator*

Line 1: *Cells vary in size as well as shape, but all cells are very small. All cells are microscopic in size. Cells can vary in shape, but they are all microscopic.*
*(D)*
Line 2: *Cells pretty much al share this one characteristic:
Options:
- (A) sensory neurons
- (B) voltage
- (C) aerobic capacity
- (D) microscopic
- (E) eukaryotic
- (F) bacteria
- (G) prokaryotic
- (H) layers of fat*

Logic of a solution: *Some parasites live on the surface of their host. Leeches are external parasites. Leeches live on the surface of their hosts.*
*(H)*
The original question: *Where do leeches live in relation to their hosts?
Options:
- (A) In their beds
- (B) body water
- (C) competing for resources
- (D) In their shoes
- (E) loose soil
- (F) In their intestines
- (G) important habitats
- (H) On their surface*

Line 1: *Excretion is the process of removing wastes and excess water from the body. Ketones are exhaled and excreted in urine. Urination is a process of removing wastes and excess water from the body.*
*(B)*
Line 2: *What is a process of removing wastes and excess water from the body?
Options:
- (A) hydration
- (B) urination
- (C) incontinence
- (D) trash can
- (E) vaporization
- (F) Cooking
- (G) body waste
- (H) Exfoliation*

Logic of a solution: *Viruses cannot reproduce by themselves. Influenza is a disease caused by viruses. Influenza is a disease that cannot reproduce by itself.*
*(D)*
The original question: *Which of these diseases cannot reproduce by itself?
Options:
- (A) fever
- (B) Leptospirosis
- (C) animals
- (D) influenza
- (E) bacteria
- (F) heat or cold
- (G) dangerous
- (H) anemia*

Logic of a solution: *Balance is the ability to sense and maintain body position. Balance is important in skiing and balance is important in life. In order to ski, it is necessary to maintain body position.*
*(G)*
The original question:
*What can maintaining body position help you to do?
Options:
- (A) work
- (B) play
- (C) move
- (D) live
- (E) rest
- (F) Lift
- (G) ski
- (H) fly*