Which evidence supports the claim that all animals have common characteristics?

Answer 1

One piece of evidence that supports the claim that all animals have common characteristics is the presence of a nervous system in all animals. While the complexity and organization of nervous systems may vary across different animal species, all animals have some form of nerve cells that allow them to perceive and respond to their environment. This shared characteristic suggests a common evolutionary origin for animals and points to the idea that all animals are united by shared biological features.