input: OPTIONS:
- pathogen of mucus
- discharge of mucus
- amoeba of mucus
- cocoon of mucus Now, answer this question: Q: What does the clitellum secrete, while the sperm received are stored temporarily? A:
A:
output: cocoon of mucus

Q: Forces which cause objects to turn around continuously in a circle are known as? A:

OPTIONS:
- frictional forces
- tension forces
- hydrodynamic forces
- centripetal forces

Answer: centripetal forces

Problem: OPTIONS:
- nuclear fuel
- biofuel
- timber
- fossil fuels
Q: Q: What do power plants burn to generate electricity? A:
Answer: fossil fuels

Problem:OPTIONS:
- rust
- spontaneous combustion
- steel oxide
- iron oxide

Q: When sparks from a steel grinder react with oxygen, what do they form? A:
****
A: iron oxide

Q: What substances function as a long-term energy store in the human body and possess long carbon chains that prevent dissolving in water? A:
OPTIONS:
- hydrocarbons
- steroids
- nanoparticles
- triglycerides
triglycerides

Q: The other ammonium ions are changed into nitrogen gas by what? A:
OPTIONS:
- fluctuations bacteria
- fungi
- accompanying bacteria
- denitrifying bacteria

Answer:
denitrifying bacteria