The following figure shows Arrhenius plots for four different reactions. Which reaction has the greatest activation energy? 
Definitions:
Prothalli
The gametophyte stage of ferns and some other non-seed plants, which is free-living and bears the sex organs.
Gemmae
Tiny balls of tissue (borne in gemmae cups) used for asexual reproduction by liverworts.
Liverworts
Liverworts are a group of non-vascular plants in the division Marchantiophyta, known for their liver-shaped gametophytes and role in early colonization of terrestrial environments.
Asexually
Reproduction without the combination of genetic material from two different parents, often involving a single organism reproducing by itself.
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