Logic of a solution: *Ethologists usually study how animals behave in their natural environment. Ethologists are scientists who study animals in their natural habitats. There are scientists who study how animals behave in their natural environment.*
*(E)*
The original question: *There are what who study how animals behave in their natural environment.
Options:
- (A) infants
- (B) heat or cold
- (C) insects
- (D) sensory neurons
- (E) scientists
- (F) people
- (G) humans
- (H) reptiles*

Line 1: *Phytoplankton are bacteria and algae that use sunlight to make food. Food gives energy. Phytoplankton and bacteria are algae that use sunlight to make energy.*
*(D)*
Line 2: *What do phytoplankton and algae need in order to make energy?
Options:
- (A) water
- (B) glucose
- (C) food
- (D) sunlight
- (E) bacteria
- (F) Light
- (G) adding heat
- (H) The Sun*

Logic of a solution: *Arteries generally carry oxygen-rich blood. Arteries carry blood away from our heart. Oxygen-rich blood is carried away from our heart.*
*(F)*
The original question: *Oxygen-rich blood is carried where?
Options:
- (A) it keeps an organism warm
- (B) mouth of rivers
- (C) The area was once underwater
- (D) running and lifting
- (E) the body's largest organ
- (F) away from the heart
- (G) Earth orbiting the Sun
- (H) four limbs*

Line 1: *Mutation creates new genetic variation in a gene pool. Fertilization increases genetic variation. Mutation and fertilization have similar effects on the gene pool.*
*(C)*
Line 2: *The gene pool expands through fertilization and:
Options:
- (A) offspring
- (B) agriculture
- (C) mutation
- (D) babies
- (E) seeds
- (F) zygotes
- (G) relocation
- (H) competition*

Logic of a solution: *Mollusks are a major food source for other organisms, including humans. Mollusks in the diorama include snails and clams. Snails are a major food source for other organisms, including humans.*
*(C)*
The original question: *What are a major food source to organisms including humans?
Options:
- (A) leeches
- (B) earthworms
- (C) snails
- (D) plants
- (E) tapeworms
- (F) trees
- (G) potatoes
- (H) bushes*

Logic of a solution: *Alternation of generations allows for both asexual and sexual reproduction. Asexual reproduction gives offspring similar to parents. Alternation of generations allows for different methods of producing offspring.*
*(F)*
The original question:
*Alternation of generations allows for different methods of producing:
Options:
- (A) genders
- (B) music
- (C) Chlorophyll
- (D) trees
- (E) Plants growth
- (F) offspring
- (G) rays or beams
- (H) infection*