Some ants live by stealing food from spider webs, walking along the non-sticky strands to grab the food. Scientists recently discovered that this spider has a special way to prevent that. What is it?
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In the process of photosynthesis, plants use water (H2O), carbon dioxide (CO2), and energy from sunlight to produce sugar. In the process, they give off oxygen (O2) as a waste product. Does the oxygen come from the water or the carbon dioxide?