In humans, birthweight can be represented by a typical bell curve. Babies of low weight lose heat more quickly (surface to volume ratio) and get ill from the infectious disease more easily, whereas babies of large body weight are more difficult to deliver through the pelvis. Which type of selection would most likely occur?

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.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).