I know that he found finches in different areas with different beak shapes....he found this was caused by the type of seeds that were available on the different islands...over time (evolution) their beaks changed to allow them to be able to survive (survival of the fittest)
Photosynthesis; light dependent and light independent reactions
As you increase in altitude, there are fewer air molecules. Due to the lower amounts of air molecules, the atmospheric pressure decreases causing the air to be harder to breath in.
B. adult
Every life cycle on this planet becomes an adult.