If you looked at the mouthparts of a grasshopper, a butterfly, and a mosquito, you would see that they are very different. Grasshopper mouthparts are adapted for cutting and grinding up tough plant food; butterflies have a single, long, curled sucking tube for drinking nectar; and mosquitoes have both a sucking tube and needlelike structures for piercing skin. In spite of their differences, though, all three insects (indeed, all 900,000 species of insects!) have mouthparts composed of the same anatomical structures in the same positions. These facts tell you that

Explanation:

This fact about the three insects shows that this insects have a common ancestor.

For the anatomical structure to be the same it means a structure or an individual who posses that anatomical structure is common to them which is the ancestor.

Although modifications has occurs, changes have abound that now give rise to different mouth structures there is still a common ground which is the anatomical structure produced by their ancestors and it is inherited and passed on to successive generations.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint