Biotechnology raises ethical questions, primarily concerning the a. ways in which knowledge should be used. b. best use of funds for biological research. c. whether life exists on other planets. d. safety of eating transgenic plants.

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.