Although hummingbirds and house flies both use wings to fly, this similarity is not based upon closely shared ancestry but rather on evolution and adaptation as a result of survival and reproduction in a given environment. The term best describing such a phenomenon is

Analogous Structures

Explanation:

Defintion of Analogous Structures: body parts that share a common function, not structure. I wish there was multiple choice but hopefully this helps.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint