Tooth length is influenced by natural selection when you have healthy teeth If you lose one tooth chances are your other tooth will be crooked until that tooth grows back in, Your teeth all help each other keep each other strait. But if you are not taking care of your teeth than your teeth will not be strong enough to grow longer or any bigger.
a group of diseases that cause progressive weakness and loss of muscle. Abnormal genes interfere with the production of proteins needed to form healthy muscles. There are many forms of Muscular Dystrophy.
When red blood cells are in a hypertonic (higher concentration) solution, water flows out of the cell faster than it comes in. This results in crenation (shriveling) of the blood cell.
