| The process of photosynthesis maintains atmospheric supplies of oxygen, essential for animal life on earth. |
| Thus leaves with lower rates of photosynthesis should have a longer lifespan to pay back the construction cost. |
| In the deep sea, where it's too dark for photosynthesis, the water teems with crabs, fish, jellyfish, mollusks, and other life-forms. |
| Two key metabolic factors in photosynthetic cells have been shown to regulate photosynthesis. |
| High temperature may also cause large, reversible effects on the rate of photosynthesis. |
| A similar trade-off exists between the photosynthesis rate per unit leaf area and leaf longevity. |
