If C4 photosynthesis prevents photorespiration, why haven't all plants evolved to use the C4 pathway?
A) C4 produces some toxic by-products.
B) C4 is not advantageous in all climates.
C) All plants will evolve to be C4 in time.
D) C4 is advantageous only in high-oxygen habitats.
E) Only some plants use C4 photosynthesis.
B
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Fill in the blank(s) with the appropriate word(s).