Trees aren't made biologically the same way as birds. For this same reasons this is why humans don't "fly". Yes, we have developed technologies to create an atmosphere forgoing the fact that we don't have wings or 'webbed' limbs to help us fight the force of gravity while in the air. This is why trees cannot fly, because they are born that way biologically for a purpose, to convert carbon dioxide to oxygen.<span />
The products that are derived from invertebrates are the following:
1. food - crabs, lobsters, oysters, octopuses: all of these are invertebrates (meaning they have no spine) and are used as food
2. shell - seashells are invertebrates and their shells are used for various purposes
3. jewelry - shells are used as jewelry, as well as pearls coming from seashells
4. silk - silk comes from silkworms, which are invertebrates
I just wouldn't pick cotton, because you get cotton from a plant.