Problem:OPTIONS:
- seasons
- nitrogen
- soil
- carbon dioxide

Q: Photosynthesis requires light, water and what else? A:
****
A: carbon dioxide

Q: Two events are defined to be simultaneous if an observer measures them as occurring at what? A:
OPTIONS:
- midnight
- opposite times
- different times
- same time
same time

Q: What state is achieved when the forward and reverse reactions proceed at equal rates? A:
OPTIONS:
- neutrality
- equality
- constant
- equilibrium

Answer: equilibrium

Question: Q: What force pulls people and objects toward the center of the earth? A:
OPTIONS:
- magnetism
- variation
- motion
- gravity
Answer: gravity

input with options: Q: Which factor often changes a protein from an inactive form to an active form? A:
OPTIONS:
- oxygen groups addition
- lipid groups addition
- nitrogen groups addition
- phosphate groups addition
output: phosphate groups addition

Problem: OPTIONS:
- iron
- lead
- silicon
- carbon
Q: Q: What element makes up the majority of coal? A:
Answer:
carbon