There are three ecological communities, each with differing species, but all of them have 100 individual plants and animals. community a has 21 species. of the 110 individuals, there are 50 individuals of one species and 3 each of the other 20 species. community b has 11 species. of the 110 individuals, there are 90 individuals of one species and 2 each of the other 10 species. community c has 11 species. of the 110 individuals, there are 10 individuals of each species. in the scenario above, which community has the greatest biodiversity?

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: