If the letter you are referring to is the one you get when you have your credit card account or bill delivered to your home, then the best answer would be most likely the second one. The letter provides the recipient information about the condition of his own bank account.
I believe the answer is "Because he got new pants"
If you're asking me what mitochondria is similar to then it would be something energetic or something that makes energy out of proteins. So it would be a powerhouse or food.
Slowly, to look for clues to the message. That’s what I went with.
