Problem: OPTIONS:
- the bladder
- the stomach
- the pancreas
- the spleen
Q: Q: What filters pathogens and worn out red blood cells from the blood? A:
Answer: the spleen

Problem:OPTIONS:
- stem
- silt
- node
- mantle

Q: What is a layer of tissue that lies between the shell and the body? A:
****
A: mantle

Q: What is defined as the product of a force times the distance over which the force acts? A:
OPTIONS:
- matter
- motion
- energy
- work
work

Q: What is the term for dating a rock based on composition decay? A:
OPTIONS:
- carbon dating
- fuel dating
- safe dating
- radioactive dating

Answer: radioactive dating

Question: Q: How does sap get to the tops of tall trees? A:
OPTIONS:
- through suction power
- via Coriolis forces
- through pressure from below
- through negative pressure
Answer: through negative pressure

input: OPTIONS:
- atmospheric fixation
- ammonia fixation
- oral fixation
- nitrogen fixation Now, answer this question: Q: What is the process of converting atmospheric nitrogen to ammonia called? A:
A:
output:
nitrogen fixation