The three examples are :

1. The living organisms vary in size from a few micrometers (e.g., microscopic bacteria) to more than 30 metres long (e.g., blue whale) and more than 100 metres tall (e.g., red wood trees of California).
2. The living organisms vary in longevity from a few days (like mosquitoes) to several thousand years (pine trees).
3. The living organisms range from colourless or transparent to brightly coloured birds and flowers.