input with options: Q: What is the foundation species of coral reef ecosystems? A:
OPTIONS:
- anemones
- crystals
- molluscs
- coral
output: coral

Q: Q: What changes water vapor to liquid water? A:

OPTIONS:
- fermentation
- global warming
- combustion
- condensation

A: condensation

input: OPTIONS:
- momentum
- density
- magnetism
- weight Now, answer this question: Q: What is the force pulling an object downward called? A:
A:
output: weight

Q: A current in a circuit needs a complete what? A:

OPTIONS:
- cause
- speed
- stream
- path

Answer: path

Problem: OPTIONS:
- velocity
- frequency
- diameter
- density
Q: Q: What expresses the mass of substance in terms of the volume occupied by the substance? A:
Answer: density

Q: What can be used to speed up biochemical reactions? A:

OPTIONS:
- proteins
- hormones
- carbohydrates
- enzymes

Answer:
enzymes