I am so sorry that I couldn’t attend your birthday party, I just have a lot of things going on and I’m trying to keep my family safe during this pandemic I hope you can understand my situation, although I wish you a happy # birthday, have a great day.
One way I would write a letter on why I couldn’t attend someone’s birthday
A trifold or a PowerPoint
Water!
Photosynthesis produces sugar and oxygen, and doesn't require or produce carbon, thus it must be water.