There is a drought on an island that makes food scares the only food available are big seeds that are difficult to crack open birds with large beaks are able to crack the seeds but birds with small and medium beaks are not. which of the following factors will lead to the evolution of the birds in the island?​

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.