Q: How many bones does the mammalian middle ear have? A:

OPTIONS:
- two
- twelve
- four
- three

Answer: three

Problem: OPTIONS:
- the diaphragm
- the heart
- the brain
- the lungs
Q: Q: What is the main organ required for respiration in mammals? A:
Answer: the lungs

Problem:OPTIONS:
- spontaneous mutation
- atomic transformation
- enthalpy
- radioactive decay

Q: What involves the emission of a particle and/or energy as one atom changes into another? A:
****
A: radioactive decay

Q: What do you call a group of organisms of the same species that live in the same area? A:
OPTIONS:
- system
- ecosystem
- biosphere
- population
population

Q: Metabolic pathways are a series of reactions catalyzed by multiple what? A:
OPTIONS:
- hormones
- vitamins
- particles
- enzymes

Answer: enzymes

input with options: Q: Soils with higher capacities generally have a larger reserve of what? A:
OPTIONS:
- hydrogen nutrients
- water
- protein
- mineral nutrients
output:
mineral nutrients