Forum:Titan Shifter Science

I have a lot of questions about shifters.

Such as...

1. Why would Eren bite himself, drawing blood, at the time that the cannon was fired?

2. How does it work, where do Shifters come from?

3. Why couldn't Eren transform in that well, when his goal WAS to transform?

I have a lot more questions, but these are my most burning ones.

Please answer!