Fire would be the answer. The car needs gas to burn. The fire needs wood to burn.
Answer:
the given analogy can be referred to the sub-heading-main heading analogy. in the given example, cave is a smaller section of a cavern and a song is a smaller part of a tune. therefore, one is the bigger part and the other is the smaller part.
Explanation:
This isn't a great story, to be quite honest. The story focuses less on the ways man used to start fires and more on the ways that nature started fires independently of humans.
That being said, it would seem as though the author is trying to express the fragility of fire early on, and it does seem as though he/she is saying that early on, humans just found a small amount of fire from a really dangerous origin to use as a kindling.
For sure, your answer should come from the second paragraph, which is the paragraph describing early kindling methods.