I think it is called a tee but that also holds the Golf ball in place until you go to hit it with the golf club.
Golfball by far.
The density of golfball is less then density of water
A golfer places a golfball on a tee.
There is no "tool", but there are different characteristics that a specific class may have, and those are used to place an animal in a class.
== == == ==
Surface area of a sphere (the golfball) = 4*pi*radius2 square cm