Which is the best way to combine the sentences above using signal words or phrases?

Both the bodies of bats and the bodies of birds are covered in fur as well as feathers.
One way the bodies of bats differ from the bodies of birds is they are covered in fur, not feathers.
The bodies of bats are covered in fur, also the bodies of birds are covered in feathers.
The bodies of bats on the other hand are covered in fur, and the bodies of birds are covered in feathers.

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

What type of persuasive appeal seeks to show that an argument is correct or valid

How does douglass contrast his childhood on colonel lloyd’s plantation with this arrival on baltimore at the auld’s?