if DNA is a long chain of genes, where does one gene stop and the next gene begin? The DNA sequence that indicates the start of a gene is called the? The DNA sequence that indicates the end of a gene is called the?

energy and particles

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.