Answer:
option.a is the correct answer
The excessive<span> force causes the muscles to swell and</span>increases<span> the pressure against the bone, leading to pain and inflammation. Shin splints can also result from stress reactions to bone fractures. The </span>constant<span> pounding can cause minute cracks in the bones of the leg. ouch</span>
DNA helps scientists to better classify organisms is because each organ has a specific kind of DNA. For an example, brains and hearts have many small types of RNA. So if a scientists see some RNA they know that its a heart or a brain.
