input with options: Q: Motor vehicles account for almost half of the consumption of what? A:
OPTIONS:
- hydrocarbon
- greenhouse gases
- electricity
- fossil fuel
output: fossil fuel

Q: Q: In science, what is constantly tested, sometimes revised, sometimes thrown out and sometimes well-established? A:

OPTIONS:
- a technique
- a study
- a variable
- a theory

A: a theory

input: OPTIONS:
- scientific control
- string theory
- independent variable
- hypothesis Now, answer this question: Q: What important aspect of the scientific method is a suggested explanation for an event, which can be tested? A:
A:
output: hypothesis

Q: When oxygen is not bound to heme and the partial pressure of oxygen is low, hemoglobin readily binds to what? A:

OPTIONS:
- iron
- carbon
- sulfur
- carbon dioxide

Answer: carbon dioxide

Problem: OPTIONS:
- particles
- Phenols
- gas
- hydrocarbons
Q: Q: The simplest class of organic compounds is the what? A:
Answer: hydrocarbons

Q: What type of experiment involves two identical experiments carried out side-by-side, with and without an independent variable? A:

OPTIONS:
- trial run
- defined experiment
- blind test
- controlled experiment

Answer:
controlled experiment