List the conditions of respirations for the respiratory surface.

Explanation

To answer the question regarding the conditions necessary for respiration at the respiratory surface, we can outline the following key points:

### Step-by-Step Solution:

1. **Thin Structure**: The respiratory surface must be thin to facilitate easy diffusion of gases. A thin membrane allows for a shorter distance for oxygen and carbon dioxide to travel, enhancing the efficiency of gas exchange.

2. **Permeability**: The surface must be permeable to both oxygen and carbon dioxide. This means that the materials making up the respiratory surface should allow these gases to pass through freely.

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