AP BIOLOGY

Detailed explanation-1: -This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-2: -For example, in unicellular organisms such as amoeba and paramecium exchange of gases takes place through plasma membrane by simple diffusion.

Detailed explanation-3: -In insects, gaseous exchange occurs through a network of tubes collectively known as the tracheal system. The small openings on the sides of an insect’s body are known as spiracles. Oxygen-rich air enters through the spiracles. The spiracles are connected to the network of tubes.

Detailed explanation-4: -Amoeba take in oxygen and give out carbon dioxide by diffusion through their cell membrane.