I believe it is a. Birds typically migrate in the wintertime to escape harsher climates to places that have more food. Also, some birds migrate to certain places when they are about to start their nesting and breeding seasons.
C. The small rocks are mechanically weathering the larger rocks and erosion is morning the pieces downstream
There is no chemical change in this so it has to be mechanically. Than erosion is causing the rocks to be moving the pieces downstream. Deposition means another thing...
Answer:
less diversity
Explanation:
since they can't reproduce with others, they're offspring is like them and not diverse.
Well...idk if you really can explain why they are so small. they are the building blocks of life, they make up anything and everything