- Eyes are usually part of an animal for seeing
- An eagle is a kind of animal
- Hence, eyes are part of an eagle for seeing

- An animal is a kind of organism
- An eagle is a kind of animal
- So, an eagle is a kind of organism

- An eagle is a kind of organism
- The colors of parts of an organism are inherited characteristics
- Hence, the colors of parts of an eagle are inherited characteristics

- Eyes are part of an eagle for seeing
- The colors of parts of an eagle are inherited characteristics
- Therefore, eye color is an inherited characteristic for eagles

- Eye color is an inherited characteristic for eagles
- Offspring inherit inherited characteristic from their parents
- So, the eye color of an eagle offspring is inherited from its parents

So, the eye color of an eagle offspring is inherited from its parents
Question
Which has the greatest effect on the color of a young eagle's eyes?

Context
- Eyes are usually part of an animal for seeing 
- Offspring inherit inherited characteristic from their parents 
- An animal is a kind of organism 
- The colors of parts of an organism are inherited characteristics 
- An eagle is a kind of animal