Logic of a solution: *Coral reefs provide food and shelter to many ocean organisms. Coral reefs are predominantly calcite. Calcite provides food and shelter to many ocean organisms.*
*(G)*
The original question: *What provides food and shelter to many ocean organisms?
Options:
- (A) houses
- (B) umbrellas
- (C) limestone
- (D) ferns
- (E) sharks
- (F) barnacles
- (G) calcite
- (H) sheds*

Line 1: *Flagella help prokaryotes move. Flagella are long filaments made up of the protein flagellin. Long filaments help prokaryotes move.*
*(A)*
Line 2: *What moves with long filaments?
Options:
- (A) prokaryotes
- (B) sponges
- (C) an object
- (D) lizards
- (E) protein
- (F) sensory neurons
- (G) insects
- (H) Most plants*

Logic of a solution: *Female gametophytes produce eggs inside the ovaries of flowers. Fruits develop from the ovary of the flower. Female gametophytes produce eggs inside the fruit of flowers.*
*(A)*
The original question: *In flowers, where do female gametophytes produce eggs?
Options:
- (A) fruit
- (B) ferns
- (C) plants
- (D) embryos
- (E) edible
- (F) seeds
- (G) bushes
- (H) orchids*

Line 1: *Male dogs use pheromones in urine to mark their territory. Pheromones are a sub-category of semiochemicals. Male dogs use semiochemicals in urine to mark their territory.*
*(D)*
Line 2: *What uses semiochemicals in urine to mark territory?
Options:
- (A) koalas
- (B) bacteria
- (C) humans
- (D) dogs
- (E) bears
- (F) cats
- (G) the Sun
- (H) rabbit*

Logic of a solution: *Centrioles are organelles involved in cell division. Centrioles come in pairs. Organelles that come in pairs are involved in cell division.*
*(F)*
The original question: *Organelles that come in pairs are involved in what?
Options:
- (A) movement
- (B) Veins and arteries.
- (C) competition
- (D) Plants growth
- (E) Animal survival
- (F) cell division
- (G) an organism's body
- (H) Plant reproduction*

Logic of a solution: *Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.*
*(G)*
The original question:
*What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish*