Eustation tubes which drain into the back of the esophagus.
Yes, if your sink drain is stuck closed, it can cause water to not drain properly.
Yes a clogged VENT pipe can cause a sluggish drain
A clogged AC drain can cause water leakage.
No.
cause
A drain made of clay sections pushed together. Old septic pipes were often made this way.
a spill into a drain at a factory
Highly unlikely.
A raidator in need of a flush will not cause a battery drain.
The wrong spark plug wire(s) can cause engine problems including not running but won't drain the battery.
No, it is not safe to dump grease down the drain as it can cause clogs and damage to the plumbing system.