Energy and matter are constantly cycled through ecosystems. Which of the following best demonstrates this process? A. Plants absorb sunlight for photosynthesis, and animals absorb sunlight for warmth. B. Producers obtain energy from other organisms, and they pass that energy on to consumers through cellular respiration. C. Producers take in carbon dioxide for photosynthesis, and most organisms release carbon dioxide through cellular respiration. D. Plants take in oxygen for photosynthesis, and they release oxygen through cellular respiration.