Problem:OPTIONS:
- molecules between organisms
- chemical bonds
- digestion
- interactions between organisms

Q: What ultimately results in the cycling of nutrients in ecosystems? A:
****
A: interactions between organisms

Q: What is the invisible force that pulls things to earth? A:
OPTIONS:
- motion
- momentum
- electromagnetism
- gravity
gravity

Q: What does burning wood release into the atmosphere? A:
OPTIONS:
- oxygen
- helium
- hydrogen chloride
- carbon dioxide

Answer: carbon dioxide

Question: Q: What is the study of viruses called? A:
OPTIONS:
- immunology
- microbiology
- biotechnology
- virology
Answer: virology

input with options: Q: What is the sum of the massess of the atoms in a molecule? A:
OPTIONS:
- underlying mass
- magnetic mass
- nuclear mass
- molecular mass
output: molecular mass

Problem: OPTIONS:
- the nucleic wall
- the cell center
- mitochondria
- the cell wall
Q: Q: What is a rigid layer that surrounds the plasma membrane of a plant cell? A:
Answer:
the cell wall