They are because, you have to take them home, and then eat them and you are not going to eat them in one day. Otherwise they will get ickey.
Bananas are green when not yet ripened, yellow when they are good to eat, and brown/black when they are rotting and going bad.
No, green bananas are under ripe. Bananas go from green to yellow to brown (ripe).
When they are yellow.
Ripe bananas reach sweetness, unripe stick a strange flavor to your tongue. Ripe ones are normally yellow with brown spots on the skin. More spots, riper it is. Sometimes, particularly on cold wheather, bananas may get ripe without spots, but all yellow.
Usually yellow. But it depends on how ripe they are. If they're not ripe yet, they're green, if they're over-ripe, they're brown, and if they're rotten, then the're black. But when they're perfect, they're yellow!
Because they are 'ripe'
Yellow.
Because the person that decided that, liked bananas and bananas are yellow when ripe
Bananas sold green will become yellow and ripe within a day or two.
If you mean "bananas" then yellow when ripe, soft when ripe, and long but slightly curved.
because the outer core deserts
Ripe bananas are typically yellow, although some varieties like plantains may have a different color when ripe. The peel may also have some brown speckles or patches when fully ripe.