Tough one would have been expressing another way?
Together organ systems make us healthy and living.
Your skin has 3 layers. The top layer is called the epidermis. The middle layer is called the dermis. The bottom layer is called the subcutaneous fat.
This character trait is known as homoplasy. the definition of homoplasy that two or more species share a character, but they did not descend from a common ancestor.
This trait is known as convergent evolution, or convergence.
