Image Jokes student jokes Why do humans have different blood groups? JK ⋅ August 25, 2016 Teacher: Why do humans have different blood groups…. Share this:Click to email a link to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Telegram (Opens in new window) Jokes Team « What we need to learn to live in reality. » Why the password showing a bunch of ****