Answer: The three main types, or classes, of rock are sedimentary, metamorphic, and igneous.
Explanation:
The differences among them have to do with how they are formed.
I believe it’s a chromosome.
<span>Answer: Bone marrow stem cells have been shown to generate cartilage, bone, and muscle when injected directly into the injured site
Stem cells could differentiate into the various type of cells, makes them able to regenerate part of the body that doesn't have regeneration abilities. The cell that involved the </span><span>tear of the rotator cuff would be cartilage, bone, and muscle. Stem cells could replace the damaged cells so that the muscle and joint might work better. </span>
