Answer:
All organisms with similar physical characteristics are believed to be related through a common ancestor. This means that they share a similar genetic makeup that makes them look and behave in a similar way. For example, all mammals share common physical characteristics such as mammary glands and hair, which suggests that they are all descendants of a common ancestor that had these traits. Similarly, all birds have feathers and lay eggs, which suggests that they are all descended from a common ancestor that had these traits. This theory of common descent is supported by the study of genetics, fossil records, and comparative anatomy, and is widely accepted by the scientific community as the best explanation for the diversity of life on Earth.
Step-by-step explanation: