Piranhas comprise more than 30-60 species of fish, depending on whom you ask. The many species fall into four genera: Pygocentrus, Pygopristis, Serrasalmus, and Pristobrycon. Piranha in the Pygocentrus genus are the most common variety, the kind you might find in a pet store. Pygopristis piranha are herbivores, feasting on seeds and fruits, not flesh. In contrast, fish in the Serrasalmus genus eat only meat, and their teeth are razor-sharp. Pristobrycon are the least friendly of all piranhas; they often bite the fins of other fish, even fish of the same species. The label piranha, then, refers to a wide variety of species.
The first part of Carson's topic sentence Soon after the spraying had ended is a transitional clause that looks back to the previous topic: DDT spraying. Topic sentences often begin with such transitional clauses referring to the previous paragraph. The second part of the topic sentence there were unmistakable signs that all was not well shapes and controls what follows. This kind of bridging helps the reader follow Carson's argument. Notice, too, how Carson further helps the reader follow her argument by providing a more focused version of the topic sentence later in the paragraph All the life of the stream was stilled. This sentence tells us exactly what Carson meant by all was not well.
Optionally, the name of a named template which is to be executed as the entry point to the transformation. This template must exist within the stylesheet . If no named template is supplied, then the transformation starts with the template rule that best matches the initial context node , according to the rules defined in Conflict Resolution for Template Rules . Either a named template, or an initial context node, or both, must be supplied.