It doesn't it is just a gimpic that people can up with to make easy money.
With all birds you have to take it to the vet to be tested. The procedure includes taking the bird's DNA under surgery and then the vet would be able to tell the sex from that.
It all depends on the distance you walked, what pace you walked it at and how much you weigh.
Margarine is like butter but is commonly used for baking.
Its not your unrine. Urine turns different colors when you are either hydrated or not. The bright color is because you are probably not drinking a lot of water. When your urine is a clear color you are perfectly hydrated.
Ah yes heathly weight loss! Just cut out soft drinks and fruit juices. Eat grapefruit or drink grapejuice. Also exercise, the best exercise is cardio. Since you want to lose weight don't to cruches because it will just make your stomach look bigger.
You usually burn the same amount of calories you ate a few days ago. So it depends.
Let me just add something, the whole not eating carbs diet is a gimic. Try eating the heathly foods you like just in porpotional sizes.
Try the Nation Geographic website, they usually would have them.
You can't really tell. It depends on his parents' height and his health history.