To select the correct body parts for the animals in question, it would be helpful to know which specific animals you're referring to. However, based on common classifications:
- Fins are typically found in fish and some aquatic animals.
- Fur is characteristic of mammals.
- Limbs can refer to arms and legs, commonly found in mammals and some reptiles.
- Scales are usually present in fish and reptiles.
- Shell is a feature of some reptiles (like turtles) and certain marine organisms (like mollusks).
If you are looking for two body parts shared by a specific group of animals (for example, fish), you might choose fins and scales. If you are considering mammals, then it would be fur and limbs.
Please specify the animals you are asking about for a more accurate response!