If you are looking for a single organelle, then I would say the mitochondria. They are the site of respiration and are adapted for efficient gas exchange.
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Gerbils have evolved special kidneys and some other adaptations to survive with very little, if any, water.
The respiratory system of birds is extremely efficient at taking in oxygen and eliminating carbon dioxide. This fact should not surprise you, as the high metabolic rate of birds demands an efficient gas exchange system.
Capillaries
Kidneys
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Two ways in which the structure of a capillary is adapted to its function is to encourage the exchange of oxygen. Another reason is to encourage the exchange of carbon dioxide.
Mesophyll cells in plant leaves are adapted to photosynthesis with a large surface area for light absorption, numerous chloroplasts for photosynthesis, and a thin cell wall for efficient gas exchange. They also contain a high concentration of enzymes and pigments involved in the photosynthetic process.
earthworms.
The placenta is adapted to carry out its function of providing nourishment and oxygen to the developing fetus by having a large surface area covered in villi for efficient exchange of nutrients and gases. It also has a rich blood supply from both the mother and the fetus, allowing for the exchange of substances between their circulatory systems. Additionally, the placenta produces hormones that help maintain the pregnancy and support fetal development.