Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 13

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
a. List examples of biotic and abiotic factors that contribute to a microbe's ability to survive within a habitat.
b. Define the term niche, and describe the many roles microbes fulfill in an ecosystem.