Do these two sentences sound correct?

[dilodi83]

Are they all correct?

A: 1) Where we do differ from other life forms is in our ability to record and learn from our collective history.
2) Where we fully (or: definitely/absolutely)differ from other life forms is in our ability to record and learn from our collective history.

B: 1) The more we learn, the better our chances of survival in the future widen.
2) The more we learn, the better are our chances of survival in the future.

[Hedwig]

They seem correct to me but I'm neither a teacher nor a native speaker. Let's see if someone else chimes in.

[dilodi83]

Any other views?

[bhaisahab]

I don't much like B 1. It's not natural.

[emsr2d2]

I don't much like B 1. It's not natural.

I agree. For a start, I don't think our chances "widen". If anything I would say:

"... the more our chances of future survival grow".

But I prefer B2.

[dilodi83]

I don't much like B 1. It's not natural.

Thanks so much...I suppose the others sound well.