Chapter 8. Extend Excel and Visual Basic
Chapter at a Glance
In this chapter, you will learn to:
Create and use custom functions.
Handle errors that occur while a macro is running.
A bacteria cell doesn’t have a nucleus. A cell without a nucleus is called a prokaryote. Prokaryotes are very important. The first known fossils, dating from three and a half billion years ago, are all prokaryotes. They are also very small. In 1999, Heide Schulz discovered the prokaryote species Thiomargarita namibiensis whose individual organisms grow to be as large as 0.75 millimeter—about the size of the head of a fruit-fly. This is astonishingly large for a bacteria but ...