input: OPTIONS:
- erosion fuels
- renewable fuels
- greenhouse gases
- fossil fuels Now, answer this question: Q: A major source of primary pollutants is the burning of oil and coal, which are types of what? A:
A:
output: fossil fuels

Q: Why do sharks sense low levels of electricity? A:

OPTIONS:
- to locate mates
- to sleep
- to reproduce
- to locate prey

Answer: to locate prey

Problem: OPTIONS:
- two
- none
- three
- one
Q: Q: How many stars are in our solar system? A:
Answer: one

Problem:OPTIONS:
- no purpose
- attracting mates
- attracting predators
- warning predators

Q: The bright color of poison dart frogs serves what purpose? A:
****
A: warning predators

Q: What type of substance is any matter that has a fixed chemical composition and characteristic properties? A:
OPTIONS:
- physical substance
- versatile chemical substance
- seawater chemical substance
- pure chemical substance
pure chemical substance

Q: A major source of primary pollutants is the burning of oil and coal, which are types of what? A:
OPTIONS:
- erosion fuels
- renewable fuels
- greenhouse gases
- fossil fuels

Answer:
fossil fuels