Which claim made by the author lacks credible evidence and details? A. With a little thought, any city dweller can think of an area of land on which to grow a garden. B. This means that irrigation for crops is not a problem. C. They also help the environment by refreshing the air and by reducing smog and effects to the ozone layer. D. Urban gardeners use these roofs to construct large planters for vegetables, grass, trees, and shrubs.

Oceans produce approximately 80 percent of the oxygen our planet needs to support animal life. pollution that reaches the ocean through dumping, oil leaks, runoff, and other processes interferes with that oxygen production and poses a real threat to the oxygen content in our atmosphere. if the oxygen content decreases, it is likely that carbon dioxide will increase. this could have dramatic consequences for life as we know it. which does this passage indicate causes a decrease of oxygen in the atmosphere?