The conditions that ensure successful exchange of gases in multicellular organis...

In multicellular organisms, exchange of gases is essential for their survival. This process occurs through the respiratory surface, which could be present in different organs such as lungs, gills, or skin. The exchange of gases happens due to a concentration gradient, which is the difference in the concentration of gases between the respiratory surface and the surrounding environment. The gases move from high concentration to low concentration until equilibrium is reached.

For efficient exchange of gases to occur, certain conditions must be met. One of the conditions is the presence of a thin membrane as the respiratory surface. This membrane allows for easy diffusion of gases between the organism and the environment. Additionally, the respiratory organ must have a large surface area to facilitate enough gas exchange.

Another important condition is the proper transportation of absorbed gases to different parts of the organism. This is usually done through the circulatory system. However, the option C, "last transportation of absorbed gases," is not a valid condition for successful gas exchange.

The correct option is E, "presence of small, dry surface area of the respiratory organ." This option is incorrect because a dry surface area would not allow for efficient exchange of gases. The respiratory surface should be moist to ensure that gases dissolve and diffuse easily.

In summary, successful exchange of gases in multicellular organisms requires a concentration gradient across the respiratory surface, the presence of a thin membrane, a large surface area, and proper transportation of absorbed gases. The correct option is E, which is incorrect as it suggests that a small, dry surface area is necessary.