Can PayPal acces my bank account without my permission?

I am still confused about this:
I have a Paypal account and let s say that i will verify it using a bank account(i haven t done it yet.)
No, my paypal account or paypal balance will consist of all the money i have on my bank account or only of the money that i have transferred to my Paypal account.?
Unde ANY circumstance can Paypal take funds from my bank account without my permission ?- no matter if there is chargeback or 180 days hold or whatever, I mean i do not want to scam anyone but I...

Can PayPal acces my bank account without my permission?

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