Yes, it is true.
Women have different size breasts. It is based on genetics.
Not going to happen. Weight loss equals fat loss. Breasts at the end of the day are pretty much fat. A lot of women actually lose weight in their breasts first.
Some pregnant women lose their balance because their posture changes. Their breasts become larger as well as their stomach and the curvature of the back is increased. All of these factors affect a women's sense of gravity.
The same reason why women cover their breasts nowadays, it was accepted by their culture to show breasts.
There is no universal agreement about size or shape of women's breasts.
This is just an educated guess, but I'm betting that you lose the same percentage (say, 10%) of fat everywhere in your body when you lose weight. In a place where you have little fat and lots of muscle, 10% of fat loss wouldn't be very obvious. Because your breasts are mostly fat, 10% of fat loss would be much more obvious, making it seem like you're losing more weight/losing weight first in your breasts.
Women have breasts because, in the womb, genes tell the embryo that it's going to be female. Female animals have breasts to store milk for their young.
Women's breasts are located on the anterior upper half of the thoracic cavity on either side of the midline.
It is unlikely that your breasts will get bigger if you lose 15 pounds. Your breasts are more likely to get smaller if you lose weight. That is because the breast is made of mostly fat and lactating glands. If you want your breasts to get bigger you can try gaining weight or getting a breast augmentation.
For cholesterol and to lose weight.
Just excercise regularly.