A sparrow needs to excrete the carbon dioxide that it produces when its cells respire. Which type of exchange does it use for this?

The sparrow uses gaseous exchange for this. Here's the step by step process:

1. The sparrow inhales air, which contains oxygen.
2. This air goes into the sparrow's lungs and then into tiny air sacs called alveoli.
3. In the alveoli, the oxygen in the air diffuses through the thin walls of the alveoli and into the bloodstream.
4. The oxygen in the blood is then transported to the cells of the sparrow's body.
5. Inside the cells, oxygen is used in a process called respiration to produce energy. Carbon dioxide is a waste product of this process.
6. The carbon dioxide diffuses out of the cells, into the bloodstream, and back to the lungs.
7. When the sparrow exhales, the carbon dioxide is removed from the body.

So, the sparrow uses gaseous exchange to excrete the carbon dioxide that it produces when its cells respire.