If we don’t consider fundamental features while classifying animals, the whole process becomes chaotic and misleading. Animals may be grouped just by appearance, which can be very different from their real evolutionary background. For example, whales look like fish but are actually mammals.

Key Difficulties Faced

• Wrong grouping – Totally unrelated animals may get placed together (e.g., whale and fish).
• Separation of similar species – Closely related animals might get separated just because of minor differences.
• No scientific basis – Classification would become subjective, based only on looks.
• Evolution ignored – Without basic features (like symmetry, coelom, segmentation), evolutionary relationships cannot be understood.‍
• Confusion in study – Scientists and students would struggle to identify, study, or compare animals.