This process involves:
* Taking in oxygen (O2), which is essential for cellular respiration to produce energy.
* Releasing carbon dioxide (CO2), a waste product of cellular respiration.
Respiration can occur through different mechanisms depending on the organism, such as:
* Pulmonary respiration: Involves the lungs in animals like mammals and birds.
* Cutaneous respiration: Involves the skin in some amphibians and other organisms.
* Gill respiration: Involves gills in aquatic animals like fish.
