DNA is the perfect way to ID individuals and the species of which they are a member. With a single cell from you, I could tell if you were a member of the highly intelligent ape family (Bonobo, Gorilla, Chimp, etc) or a mere slug or liver-fluke.
You share over 86% of your DNA with even the most distant of your slug cousins. Even bacteria share a huge amount of DNA with you. (Not with Firestar, though. He is of course not of your planet).
Now, although you have some bananas, the Chimps require 18.6718992 Trillion class "A" Fyfe Bananas per appendage that you possess. They don't give change!
Still, that asteroid is now 1.8 million miles closer to you than it was when we started this conversation. Fortunately you won't be worried about that as the ice-age will hit you about 1 million years beforehand.
But you won't care about the ice, either, as the sea levels will rise by 300 feet soon, when the Antartic ice sheet slips into the sea. (If I have the right diary, that's sometime within the next ten years).
Your oil will run out about the same time, but that will be the least of your problems.
This cheery greeting was brought to you by the Inter-Galactic Greetings Card Company.