What is the main function of scales on a fish? OPTIONS:
- to protect the fish
- to attract predators
- to help the fish find food
- to help the fish breathe
A: to protect the fish

Which two body systems are involved in inhaling oxygen and exhaling carbon dioxide? OPTIONS:
- endocrine and skeletal
- excretory and nervous
- circulatory and respiratory
- digestive and reproductive
A: circulatory and respiratory

Which of these causes the atmosphere to change? OPTIONS:
- increased inorganic matter in soil
- increased use of fertilizers on crops
- increased buildup of greenhouse gases
- increased rainfall rates near power plants
A: increased buildup of greenhouse gases

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce a saltwater solution. What are the products of this chemical reaction? OPTIONS:
- NaCl and H_{2}O
- NaOH and HCl
- HCl and NaCl
- NaOH and H_{2}O
A:
NaCl and H_{2}O