External respiration involves the Group of answer choices exchange of dissolved gases between the cells and interstitial fluids. utilization of oxygen by tissues to support metabolism. binding of oxygen by hemoglobin. movement of air into and out of the lungs. diffusion of gases between the interstitial fluid and the external environment.

Option D

Explanation:

External respiration also referred to as gas exchange describes the process of gas exchange between the bloodstream and the external environment.

It takes into account how air flows in and out of the lungs and how oxygen and carbon-dioxide are transport into the bloodstream by discussion.

It involves three main components, the lung- in particular the alveoli, the external environment and the interesting fluid (bloodstream).

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

the answer is :