Because phones lights are brighter
the main idea of the paragraph is the theories of thye earth and how its changes over time1Explanation:
Answer: Formal
This excerpt is an example of formal writing. There are several ways in which we can identify this characteristic. The excerpt discusses an academic topic, which is a literary analysis of Emerson's writing. Moreover, the sample uses formal words, such as "stress" and "pre-eminent."
A comma indicates a pause between the ending of an introductory word, phrase, or clause, and the beginning of the main part of the sentence.
# A comma is used before any coordinating conjunction (and, but, for, or, nor, so, yet) that links two independent clauses. ....
#It is also used after a dependent clause that starts a sentence. ...
#Commas also used to offset appositives from the rest of the sentence. ...
#They are used to separate items in a series. (this is the most commonly used)