Since the desert air was so dry, the bread quickly turned stale. in this sentence, which word serves as a clue that there is cause and effect? a. so b. stale c. quickly d. since

D. Since

Explanation:

Cause and effect refers to an event which causes another event to occur. In that respect, the conjunction since means because or for the reason that. As a result, the expression since the desert air was so dry implies that the aridity of the air in the desert caused the bread to become dry, hard or no longer fresh.

The rest of the alternatives are incorrect because so means very or to a great degree, stale is an adjective that means hard, rancid and unpleasant to eat, and the adverb quickly means fast.

i believe it is the first choice (1.)

because the major theme is(“both the wild and civilization have rules.”)

and also as u said,( based on what buck learns within the call of the wild, "both the wild and civilization have rules".this is true of humans within society as well.