Problem: OPTIONS:
- particles
- Phenols
- gas
- hydrocarbons
Q: Q: The simplest class of organic compounds is the what? A:
Answer: hydrocarbons

Problem:OPTIONS:
- lung
- brain
- abdomen
- heart

Q: Cardiac muscle is only found where? A:
****
A: heart

Q: What is the opposite of rarefaction zones, where air molecules in waves are loosely packed? A:
OPTIONS:
- molecules zones
- pressure wave
- measurements zones
- compression zones
compression zones

Q: Although humans require it, what accounts for just one percent of all water on earth? A:
OPTIONS:
- snow
- salt water
- glaciers
- fresh water

Answer: fresh water

Question: Q: How is carbon dioxide and water vapor that is produced by cellular respiration released? A:
OPTIONS:
- peroxidation
- fermentation
- evaporation
- exhalation
Answer: exhalation

input: OPTIONS:
- lightning
- waves
- rains
- winds Now, answer this question: Q: What are surface currents mainly caused by? A:
A:
output:
winds