input: OPTIONS:
- mass migrations
- microevolutions
- spontaneous mutations
- mass extinctions Now, answer this question: Q: What events, resulting in death of over half of animal species, have occurred on earth at least five times in the past 540 million years? A:
A:
output: mass extinctions

Q: What is the common term for single-celled fungi? A:

OPTIONS:
- sponges
- mushrooms
- prokaryotes
- yeasts

Answer: yeasts

Problem: OPTIONS:
- Pancreas
- muscles
- heart
- lungs
Q: Q: What part of the body does the mycobacterium tuberculosis bacterium usually attack? A:
Answer: lungs

Problem:OPTIONS:
- cell
- droplet
- nucleus
- atom

Q: What is the smallest unit of a chemical element called? A:
****
A: atom

Q: What is the sac-like organ at the end of the esophagus? A:
OPTIONS:
- rectum
- larynx
- appendix
- stomach
stomach

Q: Why will water balloons launched into the air eventually burst? A:
OPTIONS:
- heat
- momentum
- friction
- expansion

Answer:
expansion