What is happening at letter w that will affect the deer

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.

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 .

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b) they want the land taken away from the wealthy landowners and given to peasants.