Answer: Answers
Explanation: The urinary bladder is a muscular sac in the pelvis, just above and behind the pubic bone. When empty, the bladder is about the size and shape of a pear. Urine is made in the kidneys and travels down two tubes called ureters to the bladder. The bladder stores urine, allowing urination to be infrequent and controlled. This is FACTS
The quadriceps, they are your upper leg muscles which would help increase and maximize your leap.
It all depends. Are you stressed out? Usually stress influences your weight very significantly. Other than that, most people have higher metabolism than others which is why they won't gain weight much quicker than those with low metabolism. In most cases, it is not about exercise and what you eat because it is in your genes. Speaking medically, you can also get a checkup for worms in case.
Otherwise, in my opinion, it may be normal because I am the same age as you, a bit shorter and only weigh 99 pounds. Not stressed out, barely exercise, and sorta eat whatever I want :D. However, you can get a quick checkup in case....
I hope I was able to help you with your question. :)