What you will learn in Sorting out what there is

1. 1. What is a species, and why is it hard?

   The usual definition applied to four cases it does not settle, and why that is the answer rather than a failure.

2. 2. Naming things

   One English word for three different animals, one binomial for one organism, and the ladder a name sits on.

3. 3. Reading a tree

   Swinging a branch changes the picture and nothing else, and every living tip is at the present.

4. 4. Groups that are real and groups that are not

   Draw a boundary around some animals and find out what kind of group you have made.

5. 5. The five kingdoms, and what came after

   Two classifications thirty years apart, and the kind of evidence that separated them.

6. 6. The survey, and the awkward cases

   Diagnostic features for the major groups, then four things the criteria for life do not sort.