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Author Question: It is believed that ____________________ was used as the main source of energy for thousands of ... (Read 65 times)

skymedlock

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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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Answer to Question 1

fire

Answer to Question 2

D




skymedlock

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Reply 2 on: Jul 21, 2018
Thanks for the timely response, appreciate it


rachel

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Reply 3 on: Yesterday
Gracias!

 

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