Biodiversity Practice Test

A community survey recorded tree species in two forest plots. Plot 1 had 12 species; each species represented about 8% of individuals. Plot 2 had 12 species; one species represented 70% of individuals and the remaining 11 species shared 30%. Which explanation best accounts for the difference in diversity between plots?

A lake was surveyed at two depths. Shallow water contained 16 zooplankton species with relatively even abundances. Deep water contained 16 species, but two species comprised 90% of individuals. Sampling volume and methods were identical. Which inference is best supported about biodiversity across depths?