stamen, they produce pollen to fertilize ovaries
because they are
hibiscus
There are a number of names for the balls - generally they are called zorbing balls or OGOs.
balls
Personally I love Ernie Balls
Hitting with flat tennis balls doesn't necessarily hurt your strings all that much, but it definitely hurts your game. They can hurt your strings a little if you are using all of your might to swing into the tennis ball, and because it is flat the ball will flatten out over the strings and cause more areas of the string to become weaker.
The property that separates styrofoam balls is their buoyancy. Styrofoam balls are lightweight and have air trapped inside, making them less dense than water. This causes them to float on the surface of water, separating them from denser materials that sink.
Inside.
It's actually the "antecubital" area or region.
The inside of a whopper is called the inside of a whopper (just kidding). "Whoppers are chocolate-coated malted milk balls produced by The Hershey Company. The candy is a small, round ball about 3/4 of an inch in diameter." - wiki
there just called balls
Sheep 'balls" are called testicles; as are bovine "balls" and human "balls". "Balls" of the bovine persuasion, when prepared and cooked, are called Rocky Mountain Oysters, and sheep testicles are called "Shearer's oysters".