Problem: OPTIONS:
- gaseous heavy metals
- alloys
- sulfuric heavy metals
- toxic heavy metals
Q: Q: Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals? A:
Answer: toxic heavy metals

Problem:OPTIONS:
- carbon dioxide
- ketones
- acetic acid
- carboxylic acid

Q: What can be combined with an amine to form an amide? A:
****
A: carboxylic acid

Q: What were the electrons initially called? A:
OPTIONS:
- gamma rays
- plasma rays
- polymer rays
- cathode rays
cathode rays

Q: Along with other functions, what do carbohydrates, proteins, and lipids provide for the body? A:
OPTIONS:
- muscle
- hydrogen
- carbon
- energy

Answer: energy

Question: Q: What does burning wood release into the atmosphere? A:
OPTIONS:
- oxygen
- helium
- hydrogen chloride
- carbon dioxide
Answer: carbon dioxide

input: OPTIONS:
- carbon dioxide
- beetles
- cancer
- dutch elm disease Now, answer this question: Q: Dutch elm trees used to be common, beautiful trees in the united states. now most of them have been killed by what? A:
A:
output:
dutch elm disease