Respuesta :
A. a decrease in Oxygen
This is because trees take is Carbon Dioxide and they give off Oxygen. The more that trees are cut down the less oxygen we get.
The correct answers are a, c, and d, because trees are nature's filters. They are able to filter some of the air pollution produced. As the number of trees decreases, less pollution will be removed from the air. Â During photosynthesis, trees take in carbon dioxide and produce oxygen. The result of widespread deforestation will be an increase in carbon dioxide and a decrease in oxygen.