Chapter 18 Viruses Updated Nov. 2008. Overview: A Borrowed Life Viruses are the simplest biological systems. Most viruses are little more than aggregates.
C HAPTER 15 N OVEMBER 4 & 5, 2010. M EET THE M ICROBES TWO types of Microbes: Bacteria & Viruses -Bacteria: Can grow and multiply best in environments.
