Meaning: It is normal for cats to use their claws to make marks.
Choice of Words: Scratching is the action of using claws to make marks. Natural means something that is not artificial or man-made.
Alternative Expressions
Scratching is a common thing to do.
Meaning: This means that scratching is something that is done by many people and animals. It's not something that is unusual or strange.
Choice of Words:Scratching is the action of using your nails or claws to rub against a surface. Common means something that happens a lot or is seen often. Thing is a general word for something. Do is a verb that means to perform an action. When you put them together, "Scratching is a common thing to do" means that scratching is something that many people and animals do.
Scratching is something that animals and people do.
Meaning: This means that scratching is something that is done by both animals and people. It's not something that is unique to one group or the other.
Choice of Words:Scratching is the action of using your nails or claws to rub against a surface. Something is a general word for a thing or action. Animals are living creatures that are not human. People are human beings. Do is a verb that means to perform an action. When you put them together, "Scratching is something that animals and people do" means that scratching is an action that is done by both animals and people.