The following data are the occurrences in 2018 of the different species groups in the list of endangered and threatened species under the U.S. Endangered Species Act (U.S. Fish and Wildlife Service 2018). The taxa are listed in alphabetical order in the table. The full data set can be downloaded from whitlockschluter3e.zoology.ubc.ca.

a. Rewrite the table but list the species groups in a more revealing order. Explain your reasons behind the ordering you choose.

b. What kind of table did you construct in part (a)?

c. Choosing the most appropriate graphical method, display the number of species in each species group. What kind of graph did you choose? Why?

d. Should the baseline for the number of species in your graph in part (c) be 0 or 17, the smallest number in the data set? Why?

e. Create a version of this table that shows the relative frequency of endangered species by species group.

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Species group Amphibians Amphibians Arachnids Arachnids. Birds Birds ClamsClams CoralsCorals CrustaceansCrustaceans Fishes Fishes Insects Insects MammalsMammals ReptilesReptiles SnailsSnails Number of species 4545 1717 342342 124124 2424 2828 208208 9494 381381 146146 5555