The answer is beak shape of the birds. The finches evolved to have different beak shapes to be able to eat the food available on the different islands.
I believe it's A. If an organism changes and evolves slowly over time it is caused by variation, which helps the species adapt to it's habitat and way of life
B, overfishing in coral reef ecosystems
28.) a solid has a definite shape and a definite volume.
29.) <span>These two opposite </span>ions<span> attract each other and form the </span>ionic bond<span>. </span>Covalent bonding<span> is a form of chemical </span>bonding between<span> two non metallic atoms which is characterized by the sharing of pairs of electrons </span>between<span> atoms and other </span>covalent bonds<span>.</span>
30.) scientists use scientific notation to help shorten long numbers. an example is 23^7.
31.) one example of a chemical change is change in color.