In oceans, a large amount of photosynthesis is done by single-celled diatoms. In parts of the ocean, CO2 concentrations are very low. A few years ago, scientists discovered an adaptation in some diatoms for photosynthesizing under low CO2 conditions. Which of these might that be?
a. Smaller stomata
b. C3 photosynthesis
c. C4 photosynthesis
d. High photorespiration
