Problem: OPTIONS:
- dust
- mass
- air
- medium
Q: Q: What is the matter through which sound waves travel? A:
Answer: medium

Problem:OPTIONS:
- tissues
- lungs
- arteries
- kidneys

Q: Stones, infections, and diabetes threaten the health and functioning of what paired organs? A:
****
A: kidneys

Q: What do many scientists think are the oldest eukaryotes? A:
OPTIONS:
- prokaryotes
- plants
- arthropods
- protists
protists

Q: How do basal mammals like monotreme reproduce? A:
OPTIONS:
- cloning
- budding
- live birth
- by laying eggs

Answer: by laying eggs

Question: Q: Saliva can carry the hiv virus, but it won't spread it, unless the saliva gets into what? A:
OPTIONS:
- lungs
- kidneys
- liver
- bloodstream
Answer: bloodstream

input: OPTIONS:
- emotional
- critical
- ecological
- environmental Now, answer this question: Q: Many cancers, as well as autism, are thought to have what component, which is certainly a factor in asthma? A:
A:
output:
environmental