Logic of a solution: *HIV infects and destroys helper T cells. Scientists agree that HIV causes Aids. AIDS infects and destroys helper T cells.*
*(C)*
The original question: *What infects and destroys helper t cells?
Options:
- (A) swea
- (B) Wasps
- (C) AIDS
- (D) CO 2
- (E) PDAs
- (F) humans
- (G) heat
- (H) anemia*

Line 1: *Annelids have the amazing capacity to regrow segments that break off. Earthworms are annelids meaning segmented. Earthworms can regrow broken off segments of their bodies.*
*(D)*
Line 2: *What regrows broken off segments of itself?
Options:
- (A) barnacles
- (B) teeth
- (C) roots
- (D) earthworm
- (E) Leptospirosis
- (F) spiders
- (G) cells
- (H) root growth*

Logic of a solution: *Most people can survive only a few days without water. All people belong to the human family. Most humans can only survive a few days without water.*
*(G)*
The original question: *What can most humans only survive a few days without?
Options:
- (A) oxygen
- (B) food
- (C) edema
- (D) sex
- (E) sodium
- (F) socialization
- (G) water
- (H) liquid*

Line 1: *Organs of excretion make up the excretory system. All internal organs are vital organs. A thing that is internal and vital make up the excretory system.*
*(B)*
Line 2: *A thing that is what makes up the excretory system.
Options:
- (A) matter
- (B) vital
- (C) omniscient
- (D) external
- (E) toads
- (F) food
- (G) always angry
- (H) animals*

Logic of a solution: *Organisms that live in marine biomes must be adapted to the salt in the water. Estuaries display characteristics of both marine and freshwater biomes. Organisms that live in estuaries must be adapted to the salt in the water.*
*(G)*
The original question: *Salt in the water is something that must be adapted to by organisms who live in:
Options:
- (A) evaporation
- (B) environment
- (C) rivers
- (D) bioaerosols
- (E) our planet
- (F) Deposition
- (G) estuaries
- (H) deserts*

Logic of a solution: *Hair is a fiber that is found only in mammals. All mammals have fur or hair. Fur is a fiber that is found only in mammals.*
*(E)*
The original question:
*Fur is a fiber that is found only on what kind of animal?
Options:
- (A) animals
- (B) reptiles
- (C) bird
- (D) humans
- (E) mammals
- (F) insects
- (G) goats
- (H) Animal fur*