3. for your organ system, describe how the system works at the organ level.

Lets take the circulatory system; a simple explanation would be that first the “arties” carry the blood from the “heart” through “blood vessels” to the “capillaries” who then release oxygen and nutrients and take carbon dioxide and the waste products of cellular respiration. When that is complete the “veins” take the blood and carry it back to the “heart”.

!Hope it Helps!

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.