Question

How do we classify animals?

Answer 1

Classification:

1. The systematic arrangement of living organisms based on certain characteristics is called classification.
2. Animals are characterized based on similar physical characteristics as follows:

• Level of body organization- cellular, tissue, organ, or organ system level of organization
• Symmetry- asymmetrical or exhibits bilateral, pentamerous, radial, etc. symmetry
• Presence or absence of coelom- coelomate or acoelomate
• Similarities in circulatory, digestive, respiratory, and reproductive systems, etc.