They arn't! whoever told you that is lying!
yes grapefruits come from trees.
Grapefruits usually have twelve segments.
The acid found in grapefruits is called citric acid. It gives grapefruits their characteristic tangy taste.
All grapefruits (red or white) have seeds unless they are sold as seedless grapefruits. Even seedless grapefruits will usually still have some small pits in them.
No.
no, are you high?
3-3.3
Grapefruits and lemons are both citrus fruits.
No
you can fart on them
batteries, lemons, grapefruits (ect.)
No, they have a bitter tang. But not salty.