Answer:
because of their water splitting enzymes
Explanation:
Based on the information provided within the question it seems that plants would be considered to be one step ahead in the utilization of hydrogen as an alternative fuel source because of their water splitting enzymes. These enzymes are used in the plant's photosynthesis process to break down water into it's base elements of hydrogen and oxygen. Thus easily being able to collect their own hydrogen which is one of the biggest problems for using hydrogen as a replacement for petroleum.
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