Problem:OPTIONS:
- hydrogen
- atoms
- ions
- molecules

Q: What are the smallest particles of water called? A:
****
A: molecules

Q: The effect of gravity on circulation means that it is harder to get blood up from the legs as the body takes on this? A:
OPTIONS:
- frontal orientation
- dorsal orientation
- horizontal orientation
- vertical orientation
vertical orientation

Q: What is the first digestive organ that food enters? A:
OPTIONS:
- stomach
- tongue
- esophagus
- mouth

Answer: mouth

Question: Q: At what point can nutrients enter or exit an ecosystem? A:
OPTIONS:
- Largest Population Point
- Longest Point
- Hottest Point
- any point
Answer: any point

input with options: Q: The angle of refraction depends on the index of what? A:
OPTIONS:
- frequency
- vibration
- reflection
- refraction
output: refraction

Problem: OPTIONS:
- hormones
- carbohydrates
- iseotrops
- enzymes
Q: Q: What substances serve as catalysts in most of the biochemical reactions that take place in organisms? A:
Answer:
enzymes