Solution idea: Amphibians are the first true tetrapods, or vertebrates with four limbs. Bullfrogs eat other amphibians. Bullfrogs are of the class of creatures that were the first true tetrapods.
Q: These belong to the class of creature that were the first true tetrapods:
Options:
- (A) millipede
- (B) crabs
- (C) four limbs
- (D) bullfrogs
- (E) gastropod
- (F) a fish
- (G) warm-blooded
- (H) insects
A: (D)

Solution idea: Ants communicate with chemicals called pheromones. Honeypot ants are classified in the genus Myrmecocystus. Members of the Myrmecocystus genus communicate via chemicals called pheromones.
Q: Members of the myrmecocystus genus communicate via pheromones, which are a type of:
Options:
- (A) sense of smell
- (B) chemical receptor
- (C) organ
- (D) insects
- (E) chemical
- (F) sound
- (G) antennae
- (H) Vibrates
A: (E)

Solution idea: Cell division is how organisms grow and repair themselves. Mitosis is cell division. Mitosis is how organisms grow and repair themselves.
Q: How are organisms able to grow and repair their cells?
Options:
- (A) hospitalization
- (B) orchids
- (C) cell care
- (D) fungi
- (E) growth cells
- (F) mitosis
- (G) recovery
- (H) recycling
A: (F)

Solution idea: Sperm had to swim from male to female reproductive organs for fertilization. Male gametes are called sperm. Male gametes had to swim from male to female reproductive organs for fertilization.
Q: Why do male gametes swim from male to female reproductive organs?
Options:
- (A) temperature changes
- (B) to leave the egg
- (C) fertilization
- (D) competition
- (E) it needs them
- (F) to feed
- (G) permineralization
- (H) to heal themselves
A: (C)