The answer is, "Subordinate clause."
A subordinate clause is also known as a dependent clause, which is the opposite of an independent clause. An independent clause is a part of a sentence that can stand on its own and can still technically be a valid sentence. A dependent clause depends on the main clause to form a complete sentence.
Depending on the context of the letter, you would need an introduction, a greeting, your reason for writing this letter, what you would want to add to your letter, an ending, and your name at the end.
Lol i think tht looks like a goat
I need to see the options to answer
Thinnest would be the superlative degree.