Which of the following is not an adaptation associated with flight in birds?

Options

A. Pneumatic bones
B. Absence of Right ovary
C. Beaks
D. Air sacs in lungs

Answer

To determine which of the following is not an adaptation associated with flight in birds, we can analyze the options provided. Here’s a step-by-step solution:

### Step 1: Understand Flight Adaptations in Birds
Birds have evolved several adaptations that facilitate flight. These adaptations help them to be lightweight, efficient in movement, and capable of long flights.

### Step 2: Identify Common Flight Adaptations
1. **Pneumatic Bones**: Birds have hollow bones with air spaces that reduce their weight, making it easier for them to fly.
2. **Single Functional Ovary**: In adult birds, typically only the left ovary is functional. The right ovary becomes rudimentary, which helps in reducing body weight.
3. **Air Sacs**: Birds possess air sacs in their lungs that allow for efficient respiration, especially during prolonged flights.

### Step 3: Analyze the Options
Now, we need to evaluate the options provided in the question to identify which one does not relate to flight adaptations.

4. **Presence of Beaks**: Beaks are primarily adaptations related to feeding and do not directly contribute to the ability to fly. They vary based on the bird's diet rather than its flight capabilities.

### Step 4: Conclusion
Based on the analysis, the option that is not an adaptation associated with flight in birds is the **presence of beaks**.

### Final Answer
**The correct answer is: Presence of Beaks (Option 3)**

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