4.what did forensic anthropologists learn about "grave 15"?

The forensic anthropologists learn that "Grave 15" contained the remains of numerous women and children from the Guatemalan massacre during the height of Guatemala’s civil war. Due to their clothing and jewelry, their ancestry was traced and that they came from Río Negro. The forensic team uses DNA to identify each skeleton and return them to their families.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.