Yes, if a court terminates your rights. Or in Missouri if you've had no contact, voluntarily or not.
yes
It ends if and when the child is adopted.
... to pay child support? Yes, unless the child is adopted.
When you relinquish your parental rights so the child can be adopted you are no longer responsible for paying child support. You are liable for support until/unless child is adopted.
Generally, no.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.
Yes, until/unless the child is adopted.