You are riding in a car to a friend's house. He lives 10 kilometers to the east of your house down a straight road. There is traffic and you arrive at your friend's house in one hour. How would you describe your velocity to your friend?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).