What is precipitation

Water that falls to Earth from the atmosphere.

Explanation:

Precipitation is any form of liquid or solid water particles that fall from the atmosphere and reach the surface of the earth.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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.