These notes were taken during a class about biological evolution, but the subject title is missing. -results from immigration
-new genes brought into a population
-variation in a population increases

What do the notes describe?
gene flow
natural selection
genetic drift
mutation

one centimetre is equal to 0.01 metres

trachea, alveoli, lung capillaries, arteries

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.