Scientists commonly compare species trees with gene trees. The (a) species phylogeny of marine and freshwater stickleback fish populations and (b) the low-plate Edu gene phylogeny are shown. Which of the statements correctly describes information that can be inferred from the tree comparison (NOT just a single tree)? (a) Species tree 1000000 freshwater Omarine IL Atlantic Pacific (b) Edu gene tree More green=more plate The low-plate Edu allele must have been present in the ancestral population of sticklebacks prior to invasion to freshwater habitats from marine environment b. The low-plate Edu allele arose independently in each different freshwater habitat c. Freshwater environment was invaded independently numerous times Od. All freshwater stickleback have low-plate Edu alleles