Wings of birds and butterflies are:

Options

A. Homologous organs
B. Analogous organs
C. Vestigial organs
D. Grafted organs

Explanation

**Step-by-Step Solution:**

1. **Identify the Organs in Question**: The wings of birds and butterflies are being compared.

2. **Function of the Wings**: Both wings serve the same primary function, which is to enable flight. This is a key point in understanding their classification.

3. **Examine the Origins**: The next step is to look at the evolutionary origins of these wings. Birds belong to the class Aves, which are vertebrates, while butterflies are insects, which are invertebrates. This highlights a significant difference in their evolutionary lineage.

4. **Define Analogous Organs**: Given that both wings serve the same function (flight) but have different evolutionary origins, they are classified as analogous organs. Analogous organs are those that perform similar functions but do not share a common ancestor.

5. **Contrast with Homologous Organs**: To further clarify, homologous organs are those that share a common ancestor but may have different functions. An example is the wing of a bat and the arm of a human, which both derive from a common ancestral structure but serve different purposes.

6. **Consider Other Types of Organs**: The transcript also mentions vestigial organs (which are remnants of organs that had a function in ancestors) and grafted organs (which are surgically implanted). However, these do not apply to the wings of birds and butterflies.

7. **Conclusion**: Therefore, the wings of birds and butterflies are classified as analogous organs due to their similar function but different evolutionary origins.

**Final Answer**: The wings of birds and butterflies are analogous organs.

---