Please help with homework Solution Total richness: The null hypothesis should be rejected. The graph clearly shows that the total species richness is affected by the presence of invasive species leafy spurge. Native richness: The hypothesis is true. The graph clearly shows that the total species richness was not affected by the presence of invasive species leafy spurge. Simpsons diversity: The hypothesis is should be rejected as the diversity of the plant community is affected by the presence of invasive species leafy spurge. Total richness: The hypothesis is true. Species richness is not affected by distance from the previous trail..