Insects rest on trees. Birds eat insects. A dark species of insect is resting on a light tree, and a light species of insect is resting on the same tree, but it blends in with the tree. A hungry bird comes along. Tell what the bird will do, and how this is an example of natural selection.

The bird will nest by the light because he knows there will be food there.

Explanation:

The bird will eat the light species.

Explanation:

This would be an example of natural selection because you have some insects that have adapted to the environment in order to survive. The bird can't see the dark insects and  can see the light species, so the bird would pick and eat the light insects instead of the dark species.

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

i am going to guess that it is co2.