Logic of a solution: *Mating is generally preceded by courtship. Courtship is similar across species. Mating is generally similar across species.*
*(E)*
The original question: *What is generally similar across species?
Options:
- (A) tail fins
- (B) our star
- (C) the eyes
- (D) vision
- (E) mating
- (F) Flowers
- (G) bushes
- (H) alpacas*

Line 1: *Organisms that live in marine biomes must be adapted to the salt in the water. Organisms or living beings are literally things that are alive. Living beings that live in marine biomes must be adapted to the salt in the water.*
*(D)*
Line 2: *Living beings in marine biomes must be adapted to what in the water?
Options:
- (A) CO 2
- (B) stress
- (C) liquid
- (D) salt
- (E) heat
- (F) an ion
- (G) energy
- (H) motion*

Logic of a solution: *Chromosomes contain genes, which code for proteins. Protein builds and repairs body tissue. Chromosomes contain genes, which code for body tissue.*
*(C)*
The original question: *Chromosomes contain genes, which code for
Options:
- (A) Most plants
- (B) Plants growth
- (C) body tissue
- (D) Animal survival
- (E) animals
- (F) Chemical energy
- (G) peachleaf willow
- (H) A Greek letter*

Line 1: *Amphibians have a relatively complex circulatory system with a three-chambered heart. All frogs are amphibians. Frogs have a three-chambered heart.*
*(F)*
Line 2: *Frogs have a _-chambered heart.
Options:
- (A) alveoli
- (B) organ
- (C) ovaries
- (D) oxygen
- (E) edible
- (F) three
- (G) nektar
- (H) CO 2*

Logic of a solution: *Arthropods are the largest phylum of invertebrates. Invertebrates are animals without a backbone. Arthropods are animals without a backbone.*
*(F)*
The original question: *What don't arthropods have?
Options:
- (A) an exoskeleton
- (B) legs
- (C) Bodily water
- (D) Damaged hearing
- (E) kinetic energy
- (F) a backbone
- (G) Energy
- (H) backs*

Logic of a solution: *Male dogs use pheromones in urine to mark their territory. Generally, pheromones are volatile substances. Male dogs use volatile substances in urine to mark their territory.*
*(B)*
The original question:
*Male dogs use what in their urine to mark their territory?
Options:
- (A) hydrocarbons
- (B) volatile substances
- (C) kinetic energy
- (D) an area swollen with pus
- (E) Chemical energy
- (F) competing for resources
- (G) add a solute
- (H) Positive charges*