Account for the fact that the hind limbs of rabbits and birds have a similar basic structure. [5] Note: This is question relates to part of the biodiversity topic (WJEC), under the title assessing relatedness of organisms using physical features.

the cell cycle is the final answer! : )

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.