- A bird is a kind of animal
- An animal is a kind of organism
- Hence, a bird is a kind of organism

- A bird is a kind of organism
- If a fossil is of an organism that cannot be identified then that organism is probably extinct
- So, if a fossil of a bird cannot be identified then that kind of bird is probably extinct

Therefore, if a fossil of a bird cannot be identified then that kind of bird is probably extinct
Question: A complete fossil has been found of a type of bird that cannot be identified. What can most likely be determined about the bird from the fossil?
Context: - A bird is a kind of animal 
- If a fossil is of an organism that cannot be identified then that organism is probably extinct 
- An animal is a kind of organism