Line 1: *Lipids may consist of fatty acids alone, or they may contain other molecules as well. All biological membranes contain lipids as the major constituent. All biological membranes have lipids as the main consituent which consist of fatty acids.*
*(C)*
Line 2: *What is the major thing that biological membranes consist of?
Options:
- (A) chemicals
- (B) glucose
- (C) lipids
- (D) Energy
- (E) complex
- (F) oxygen
- (G) matter
- (H) an ion*

Logic of a solution: *Cell division is how organisms grow and repair themselves. Mitosis is cell division. Mitosis is how organisms grow and repair themselves.*
*(F)*
The original question: *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*

Line 1: *Balance is the ability to sense and maintain body position. Another name for sense of body position is proprioception. Balance involves proprioception ability.*
*(H)*
Line 2: *What is proprioception part of?
Options:
- (A) tail fins
- (B) genus
- (C) fur seals
- (D) animals
- (E) athletes
- (F) movement
- (G) humans
- (H) balance*

Logic of a solution: *Ants communicate with chemicals called pheromones. Physiologically, ants leave a trail of pheromones, which other ants then follow. Ants communicate by leaving chemical trails for other ants to follow.*
*(H)*
The original question: *How do ants communicate to other ants to encourage them to follow?
Options:
- (A) Skywriting
- (B) Electrical energy
- (C) Using a phone to communicate
- (D) Leaving a written communicatio
- (E) Something coming from a gland
- (F) By wind and rain
- (G) Chemical energy
- (H) Leaving chemical trails*

Line 1: *Earthworm burrows help aerate soil, which is also good for plants. Earthworms Earthworms are in the phylum Annelids. Annelid burrows help aerate soil, which is also good for plants.*
*(H)*
Line 2: *What burrows help aerate soil, which is also good for plants?
Options:
- (A) leaves
- (B) adding heat
- (C) Exfoliation
- (D) good
- (E) roots
- (F) wind
- (G) rocks
- (H) annelids*

Line 1: *Echinoderms lack respiratory and excretory systems. Echinoderms in the diorama include the crinoids and blastoids. Crinoids and blastoids lack respiratory and excretory systems.*
*(E)*
Line 2:
*What lack respiratory and excretory systems?
Options:
- (A) They may not survive.
- (B) members of their own species
- (C) platypus
- (D) humans
- (E) crinoids and blastoids
- (F) passenger pigeons
- (G) graptolites
- (H) whales*