28. Plants
Seedless Vascular Plants
Multiple Choice
Multiple ChoiceThe first large forests formed in the Carboniferous period. The decrease in CO2 levels by all of these plants caused __________.
A
global warming
B
a lack of CO2 for photosynthesis
C
the formation of fewer stomata in plant leaves
D
seed plants to become the dominant types of plants on Earth
E
global cooling
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