The first hominin species to exhibit care-giving behavior in which elderly and infirm members of the social group are provisioned by other is: A. Australopithecus Africanus
B. Homo-Sapiens
C. Homo-Erectus
D. Sahelanthropus tchadensis
E. Homo-floresiensis

this is math not biology xd

true                                                                                                       true true true true true true

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.