Answer:
ATP production this is the conversion of some glucose formed and in this process oxygen is also released for the deer. letter ( W )
the release of oxygen during the ATP production is essential to the survival of the deer.
Step-by-step explanation:
plants/ trees take in carbon dioxide produced by the animal/deer at Z and combines it with the sunlight energy and water to produce glucose from carbon dioxide and water found and the glucose formed is been converted to ATP at W and during the process of converting the glucose formed to ATP through cellular respiration oxygen is released to the deer at X which the deer breaths in and uses for its own respiration at Y .