Which of the following adaptations enables animals without a specialized respiratory system to efficiently exchange gases with their environment?

Question

Answer

Presence of moist, thin body surfaces with a high surface-area-to-volume ratio.

Answer

Circulatory systems that transport oxygen directly to cells via haemoglobin.

Answer

Development of lungs with alveoli to increase surface area.

Answer

Use of diaphragm muscles to ventilate internal organs.

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