In article <[Only registered users see links. ]>,
br945 <[Only registered users see links. ]> wrote:
"Trees" encompasses tens or hundreds of thousands of species of many
different groups of plants. Rates of photosynthesis depend on
temperature, light exposure and intensity, water, CO2 and mineral
nutrient availability, season, health, age and other factors.
Oxygen is produced by photosynthesis, which requires light. However,
plants that need to conserve moisture often have some mechanism for
limiting gas exchange to darkness, when the ambient air is cooler and
Like just about every simple question about biology, the only real
answer is "It depends".