Problem:OPTIONS:
- pectoral
- cartilage
- heart
- diaphragm

Q: What muscle in the chest helps inflate and deflate the lungs? A:
****
A: diaphragm

Q: All alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes all have a formula of cnh2n+2. the number of carbon atoms present in an alkane has what? A:
OPTIONS:
- done limit
- crippling limit
- such limit
- no limit
no limit

Q: What two activities are especially important when a number of local populations are linked, forming a metapopulation? A:
OPTIONS:
- family reunions and emigration
- flow and emigration
- immigration and family reunions
- immigration and emigration

Answer: immigration and emigration

Question: Q: Twin studies have been instrumental in demonstrating what type of component in autism? A:
OPTIONS:
- internal
- bacterial
- natural
- environmental
Answer: environmental

input with options: Q: Van der waals forces are weak interactions between molecules that involve what? A:
OPTIONS:
- atoms
- particles
- photons
- dipoles
output: dipoles

Problem: OPTIONS:
- high density
- large mass
- gravity
- gas bubble holes
Q: Q: What helps pumice float in water? A:
Answer:
gas bubble holes