All the traits mendel studied were controlled by one gene that had only two possible alleles.

true
false

a: the sheep and waste material both release carbon into the atmosphere.

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.