Fact: Octopuses are aliens

Ok... they might not be aliens, but they do seem like aliens: they... you know what? I always just say the facts like a "know-it-all" but this time I'm not going to tell you the facts, you'll have to guess them: I'll ask you 3 questions about octopus and you can tell me how many you got right. I'll leave the answers in the comments. Let's see how much you know about my favorite sea animal.

1- How many hearts does an octopus have?

2- How many brains does an octopus have?

(Hint: the number of hearts and brains is different)

3- What color is their blood?