20 PTS!! What is a synonym for/more formal way of saying "one good turn deserves another"?

Need with this plz someone me aspa really need with this! asap

Free points cus im rlly bored (might get reported but ya kno idc oh n i made a backup for whenever i get banned its ilovetacobell24 *which is tru me n taco bell are in a long term relationship*)

Subject: save the whales! dear professor crest, i know you are really busy and everything, but i was hoping that you could spend more time thinking about how to save the whales. it’s up to us to speak up on their behalf. it’s really wrong that some amusement parks use these poor, defenseless animals for recreational purposes. this must be stopped, and you’re the person to do it! ttyl, jules which revisions would make this e-mail more formal? check all that apply. a. removing the contractions b. removing the exclamation points c. removing the salutation d. removing the slang and casual speech e. removing the information about amusement parks