What is the basis of the classification of Animalia?
The basis of classification of Animalia are: - (i) Notochord: - It is a rod-like structure found in the chordates. It is not found in non-chordates. (ii) Symmetry: - It is the plan of arrangement of body parts. They are of three types: - Asymmetrical, radially symmetrical, and bilaterally symmetrical. (iii) Organisation: - Animals have a cellular grade of organisation. Their bodies are made up of cells, while others have tissues, organs, and organ systems. Embryonic layers: - Ectoderm, mesoderm and endoderm are three embryonic layers that give rise to different organs in the body. These are also called germinal layers. Some animals are diploblastic, for example-sponges, but others are triploblastic having three germinal layers.
