Logic of a solution: *Running water is better able to dissolve oxygen and nutrients than standing water. To make it rich in nutrients so the plants are healthier. Running water is healthier for plants than standing water.*
*(D)*
The original question: *For plants, what is the difference between running and standing water?
Options:
- (A) wind and rain
- (B) precipitation
- (C) distance
- (D) healthier
- (E) seasons
- (F) temperature
- (G) heat produced
- (H) root growth*

Line 1: *Excretion is the process of removing wastes and excess water from the body. Ketones are exhaled and excreted in urine. Urination is a process of removing wastes and excess water from the body.*
*(B)*
Line 2: *What is a process of removing wastes and excess water from the body?
Options:
- (A) hydration
- (B) urination
- (C) incontinence
- (D) trash can
- (E) vaporization
- (F) Cooking
- (G) body waste
- (H) Exfoliation*

Logic of a solution: *Electron transport is the final stage of aerobic respiration. Aerobic respiration occurs only in the presence of oxygen. Electron transport occurs only in the presence of oxygen.*
*(D)*
The original question: *Electron transport requires which of the following?
Options:
- (A) electron microscope
- (B) sodium
- (C) Energy.
- (D) Oxygen
- (E) fission
- (F) warmth
- (G) flagellum
- (H) Energy*

Line 1: *Flowing water can slowly dissolve carbon in sedimentary rock. Limestone is a type of sedimentary rock. Flowing water can slowly dissolve carbon in limestone.*
*(F)*
Line 2: *Flowing water from a mountain can dissolve carbon in what kind of rock?
Options:
- (A) magma
- (B) loose soil
- (C) loose dirt
- (D) precipitation
- (E) pumice
- (F) limestone
- (G) wind and rain
- (H) andesite*

Logic of a solution: *Most mollusks have shells. Mollusks are invertebrates and are no exception. Some invertebrates have shells.*
*(H)*
The original question: *Some invertebrates may have which feature?
Options:
- (A) invertebrate
- (B) fat
- (C) gills
- (D) exception
- (E) three
- (F) mollusk
- (G) complex
- (H) shell*

Logic of a solution: *Digestion is the process of breaking down food into components the body can absorb. Food proteins are changed into energy or heat to be used or absorbed by the body. Digestion is the process of breaking down food proteins into energy or heat.*
*(E)*
The original question:
*What is the process of breaking down food proteins into energy or heat?
Options:
- (A) dissecting
- (B) dehydration
- (C) elimination
- (D) energy
- (E) digestion
- (F) Cooking
- (G) calorie retention
- (H) Evaporation*