Some types of aquatic frogs spend the winter hibernating, buried in the mud at

answer; a male inherits only one allele of the x-linked gene controlling hair color;

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.