Line 1: *Air pollution harms the respiratory and circulatory systems. Nitrogen oxides cause air pollution. Nitrogen oxides harms the respiratory and circulatory systems.*
*(D)*
Line 2: *Harm to the respiratory and circulatory systems can come from 
Options:
- (A) Greenhouse gases
- (B) hydrocarbons
- (C) Sulfur dioxide
- (D) nitrogen oxides
- (E) burning coal
- (F) fossil fuels
- (G) emissions
- (H) Greenhouse gasses*
Logic of a solution: *Most invertebrates have a nervous system. Insects are the most common invertebrates. Insects have a nervous system.*
*(H)*
The original question: *What has a nervous system?
Options:
- (A) animals
- (B) tortoises
- (C) crocodiles
- (D) sponges
- (E) elephants
- (F) placozoans
- (G) mesozoans
- (H) insects*
Line 1: *Oxygen is essential for cellular respiration for all aerobic organisms. Fungi are aerobic organisms. Oxygen is essential for cellular respiration for fungi.*
*(H)*
Line 2: *Oxygen is essential for cellular respiration for what?
Options:
- (A) Man
- (B) Energy.
- (C) humans
- (D) plants
- (E) animals
- (F) Energy
- (G) health
- (H) fungi*
Logic of a solution: *Chromosomes are the form of the genetic material of a cell during cell division. Microtubules form part of the mitotic spindle that moves the chromosomes during cell division. Microtubules move the genetic material of a cell during cell division.*
*(B)*
The original question: *What structure moves the genetic material of a cell during cell division?
Options:
- (A) an organism's body
- (B) microtubules
- (C) Most plants
- (D) Chemical energy
- (E) Plant reproduction
- (F) Electrical energy
- (G) pollen
- (H) A computer*
Line 1: *Populations of viruses do not grow through cell division because they are not cells. Where most viruses are DNA, HIV is an RNA virus. Populations of HIV do not grow through cell division because they are not cells.*
*(F)*
Line 2: *What does not grow through cell division?
Options:
- (A) p53
- (B) AIDS
- (C) host
- (D) DDT
- (E) lung
- (F) HIV
- (G) corn
- (H) HPV*
Line 1: *All life relies on a relatively narrow range of pH, or acidity. Acidity is measured with a pH meter or with pH paper strips. All life relies on a relatively narrow range of something you can measure with paper strips.*
*(C)*
Line 2:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
*What relies on a relatively narrow range of something you can measure with paper strips?
Options:
- (A) Length
- (B) voltage
- (C) all life
- (D) mammals
- (E) humans
- (F) Most plants
- (G) agriculture
- (H) animals*