Evolutionary Modifications to the Basic Type of Photosynthesis Have Enabled

Evolutionary modifications to the basic type of photosynthesis have enabled some plants to improve their water use efficiency. Which of the following statements is correct?

A) C₃ plants are able to photosynthesise effectively with very low levels of CO₂.
B) Facultative CAM plants can switch from C₃ to CAM photosynthesis as water becomes limiting.
C) CAM plants have very high levels of water use efficiency and high rates of photosynthesis.
D) C₄ plants are rarely found in arid environments.
E) CAM plants use less water in the photosynthetic ATP production than do C₃ plants.

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