They all live on land. They all have hair or fur. They are all good swimmers. They all live in warm climates.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Nicole is learning about the characteristics of different vertebrates. Which is a common characteristic of mammals?
Possibilities:
- They all live on land.
- They all have hair or fur.
- They are all good swimmers.
- They all live in warm climates.

They all have hair or fur.