Comparison of genetic elements in Caenorhabditis species relative to C. brenneri and classification of selfing and outcrossing species using those features. a) Ratios of exon counts (orange) and fraction of intergenic regions (gray) between a focal species and C. brenneri in corresponding syntenic blocks (see Fig. 4) along the C. brenneri genome. b) Coefficients of genomic features used in the GLM for classifying selfing and outcrossing species. *** denotes Bonferroni-corrected P-values < 0.0001. c) Permutation importance of features for classifying nematodes into selfing and outcrossing species.