The costal cartilage connects the ribs to the sternum. Costal cartilage normally allows forward movement of the ribs, providing flexibility to the chest wall. There are usually 12 pairs of cartilage associated with the rib cage.
The answer is A), B) and F). The main function of the heart is to pump blood throught all the body, and in that way ensure that all the body tissues recives oxygen. Also it moves the blood with out oxygen to the lungs to reoxygenate it.
The definition of homology is the existence of shared ancestry between a pair of structures, or genes. DNA contains the genes of a person therefore making itself a homology.
A scientist is someone who systematically gathers and uses research and evidence, to make hypotheses and test them, to gain and share understanding and knowledge
