input: OPTIONS:
- stratosphere
- core
- mountain ranges
- sea level Now, answer this question: Q: Where is the pressure of gases in the atmosphere at its greatest? A:
A:
output: sea level

Q: The lungs perform gas exchange using air and what fluid, which is coming and going from the heart? A:

OPTIONS:
- mucus
- water
- saliva
- blood

Answer: blood

Problem: OPTIONS:
- carbon
- nitrogen
- carbon dioxide
- oxygen
Q: Q: Water affects the availability of what important element in aquatic environments and in flooded soils? A:
Answer: oxygen

Problem:OPTIONS:
- ridges
- crevasses
- faults
- fissures

Q: Lava erupts through long cracks in the ground, also called what? A:
****
A: fissures

Q: Humans and other animals can suffer from diets lacking in what essential "ingredients"? A:
OPTIONS:
- fiber
- steroids
- liquids
- nutrients
nutrients

Q: Prokaryotes are successful because of the ________ of reproduction in favorable environments A:
OPTIONS:
- order
- cycle
- volume
- speed

Answer:
speed