| 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. |
| A similar trade-off exists between the photosynthesis rate per unit leaf area and leaf longevity. |
| Ferns generally lack some of the more typical adaptations of xerophytes, such as a thick hypodermis, sunken stomata, and CAM photosynthesis. |
| Understanding factors that affect canopy photosynthesis would contribute to agriculture, ecology, meteorology, and global science. |
| Flooding significantly enhanced the rate of photosynthesis at all light levels in both populations. |
