Which of the following explains how water is recycled on Earth? A. Ice gains heat, becomes liquid, and changes back to ice as it loses heat. B. Ice gains heat, becomes a liquid, gains more heat, and forms a gas (water vapor). C. Liquid water gains heat, evaporates into the air as water vapor, gathers into clouds, and then falls back to earth as a liquid as it loses heat. D. All of the above.

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Me ! which of the following is an environmental concern of genetically modified foods? a) crops that are drought resistant are introduced providing food regardless of the unpredictable weather b) reduction cost of production for the crops c) an important ingredient may be introduced in a strain of rice for the poor who depend on rice as a primary food d) toxic substances produced as a pesticide may be consumed by unintended species