Logic of a solution: *Yeast reproduce asexually by budding. Yeast Saccharomyces cereviceae, or yeast, is a fungus. Fungus reproduce asexually by budding.*
*(F)*
The original question: *What can reproduce asexually by budding?
Options:
- (A) Trees
- (B) bacteria
- (C) Flower buds
- (D) People
- (E) plants
- (F) Fungus
- (G) fungi
- (H) Flowers*

Line 1: *Lipids may consist of fatty acids alone, or they may contain other molecules as well. Lipids Lipids are diverse hydrophobic molecules. Diverse hydrophobic molecules may consist of fatty acids alone.*
*(H)*
Line 2: *Diverse hydrophobic molecules may consist of what type of acids?
Options:
- (A) Acids
- (B) solutes
- (C) watery
- (D) three
- (E) cell
- (F) rings
- (G) dry
- (H) fatty*

Logic of a solution: *Cells cannot survive without oxygen. And oxygen, O2, is the molecule to do it. Cells cannot survive without O2.*
*(C)*
The original question: *What is something cells cannot survive without?
Options:
- (A) gas
- (B) Air
- (C) O2
- (D) CO2
- (E) Ca
- (F) O3
- (G) Fe
- (H) He*

Line 1: *Mollusks are a major food source for other organisms, including humans. Mollusks are invertebrates and are no exception. Intervertebrates are a major food source for other organisms, including humans.*
*(D)*
Line 2: *What is a major food source for humans?
Options:
- (A) poison dart frogs
- (B) honeybees
- (C) barnacles
- (D) intervertebrates
- (E) other humans
- (F) photosynthesis
- (G) the body's largest organ
- (H) Most plants*

Logic of a solution: *Monotremes are mammals that reproduce by laying eggs. Unlike most mammals, female monotremes have no teats. Female monotremes reproduce by laying eggs and have no teats.*
*(D)*
The original question: *Female monotremes reproduce by laying eggs and have no what?
Options:
- (A) alveoli
- (B) fusion
- (C) embryos
- (D) teats
- (E) rings
- (F) pollen
- (G) food
- (H) eyes*

Logic of a solution: *Amphibians have sense organs to smell and taste chemicals. Smell and taste belong to our chemical sensing system. Amphibians have a chemical sensing system.*
*(D)*
The original question:
*Amphibians have what sort of sensing system?
Options:
- (A) strong
- (B) retina
- (C) four limbs
- (D) chemical
- (E) mechanical
- (F) the eyes
- (G) nerves
- (H) heat or cold*