Which describes the role of oxygen in photosynthesis? O It is a reactant, so it is released by the plant. O It is a product, so it is released by the plant. O It is a reactant, so it enters the plant. O It is a product, so it enters the plant. Hark this and return Save and Exit Next Submit

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.