Problem: OPTIONS:
- gases
- liquids
- propellants
- reactants
Q: Q: In a chemical reaction, what, in general, comes together in order to form a product? A:
Answer: reactants

Problem:OPTIONS:
- atherosclerosis
- embolus
- clots
- thrombus

Q: What is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel called? A:
****
A: thrombus

Q: What type of archaea live in salty environments? A:
OPTIONS:
- arthropods
- sporozoans
- amphibians
- halophiles
halophiles

Q: What is the set of steps that scientists use to learn about the world? A:
OPTIONS:
- philosophic method
- rhythm method
- Socratic method
- scientific method

Answer: scientific method

Question: Q: What element once commonly used in paint and gasoline has now been found to have dangerous effects? A:
OPTIONS:
- plastic
- chromium
- niacin
- lead
Answer: lead

input: OPTIONS:
- large
- nuclear
- multiple
- radioactive Now, answer this question: Q: The actinides are all what type of elements? A:
A:
output:
radioactive