1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
The fundamental characteristics are basically used to establish relationships between animals while specific characteristics show us how animals despite having similar fundamental characteristics differ from each other. For example, all animals lack a cell wall and are heterotrophs, these are the fundamental characters that put all animals together in kingdom Animalia. However, the presence of mammary glands is a specific character that differentiates mammals from other vertebrates and animals. If common fundamental features are not taken into account then
1. The interrelationship among different animals will not be traceable.
2. The picture of all animals at a glance will not be projected.
3. We won't be able to get a clear picture of how evolution occurred.