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Author Question: It is believed that ____________________ was used as the main source of energy for thousands of ... (Read 47 times)

skymedlock

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on: Jul 21, 2018
It is believed that ___________________ _ was used as the main source of energy for thousands of years before other sources were developed.
 
  Fill in the blank(s) with correct word

Question 2

What is the highest component of natural gas?
 
  a. Propane c. Butane
  b. Hydrogen sulfide d. Methane


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tofugiraffe

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Reply #1 on: Jul 21, 2018
Answer to Question 1

fire

Answer to Question 2

D


skymedlock

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Reply 2 on: Jul 21, 2018
Gracias!

nguyenhoanhat

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Reply 3 on: Yesterday
:D TYSM

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