How do the baby’s respiration and circulation change when the baby is born ?

D.

Explanation:

Before a baby is born it never breathes oxygen until it leaves the mother. So after they are born they no longer rely on the mom for oxygen and in turn they start to breath on their own.

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.