Logic of a solution: *Viruses are so small that they can be seen only with an electron microscope. Viruses Viruses are very small, a few nanometers in size. Objects that are only a few nanometers in size can be seen only with an electron microscope.*
*(A)*
The original question: *Objects that are a few nanometers in size can be seen only with:
Options:
- (A) an electron microscope
- (B) refraction of light
- (C) matter vibrating
- (D) ultrasound
- (E) The bending of a ray of light
- (F) slight magnification
- (G) flashlights
- (H) lens*

Line 1: *Pneumonia may be caused by an infection or injury of the lungs. Streptococcal pneumonia is caused by the bacteria Streptococcus pneumoniae. Streptococcus can infect the lungs following injury.*
*(D)*
Line 2: *What can make lungs more at risk for infection by streptococcus?
Options:
- (A) Allergies
- (B) bacteria
- (C) Pollution
- (D) injury
- (E) fungi
- (F) sweating
- (G) the skin
- (H) smoking*

Logic of a solution: *Cell division is how organisms grow and repair themselves. Mitosis is cell division. Mitosis is how organisms grown and repair themselves.*
*(G)*
The original question: *_ is how organisms grow and repair themselves.
Options:
- (A) complex
- (B) recycling
- (C) properties
- (D) fusion
- (E) fission
- (F) bacteria
- (G) Mitosis
- (H) potatoes*

Line 1: *Thyroid hormones increase the rate of metabolism in cells throughout the body. Metabolism is the process of converting food to energy. Thyroid hormones increase the rate of converting food to energy.*
*(G)*
Line 2: *Thyroid hormones increase the rate of
Options:
- (A) by making heat
- (B) the rest of the body
- (C) female sex cells
- (D) Helps them grow
- (E) hydration of their cells
- (F) heat produced
- (G) converting food to energy
- (H) aerobic capacity*

Logic of a solution: *Amphibians have permeable skin that easily absorbs substances from the environment. Natural Toxins Toxins are poisonous substances from bacterias, plants or animals. Amphibians have permeable skin that can easily absorb toxins from bacterias, plants or animals.*
*(B)*
The original question: *Why can amphibians easily absorb toxins?
Options:
- (A) salamanders
- (B) permeable skin
- (C) hydrate their cells
- (D) it needs them
- (E) poisonous frogs
- (F) Pesticides
- (G) cold blooded
- (H) bending light rays*

Logic of a solution: *Amphibians are the first true tetrapods, or vertebrates with four limbs. Bullfrogs eat other amphibians. Bullfrogs are of the class of creatures that were the first true tetrapods.*
*(D)*
The original question:
*These belong to the class of creature that were the first true tetrapods:
Options:
- (A) millipede
- (B) crabs
- (C) four limbs
- (D) bullfrogs
- (E) gastropod
- (F) a fish
- (G) warm-blooded
- (H) insects*