Here's why:
* Homologous organs have a common evolutionary origin. They may look different and have different functions, but they share a common underlying structure due to their shared ancestry.
* Analogous organs have similar functions but have evolved independently. They do not share a common evolutionary origin.
Human nails and cat claws are analogous organs. While they both serve as protective coverings and tools for grasping and digging, they have evolved independently.
* Human nails are made of keratin and grow from the nail bed, forming a flat, hard plate.
* Cat claws are made of keratin and grow from a bony sheath called the claw capsule. They can be retracted for protection and extended when needed.
The structural differences and separate evolutionary origins of human nails and cat claws make them analogous, not homologous, organs.