Your friend José, who's an art major, learned a startling fact: that our lower intestines are bursting with microbes; containing a "million's million" colony forming units per milliliter (or 1012 cfu/ml).

As a microbiologist, what would you tell your alarmed friend?

A) That this value is an underestimate of the true number of microbes in our lower intestine.

B) That this value is an overestimate of the true number of microbes in our lower intestine.

C) That this value is a fairly accurate estimate of the true number of microbes in our lower intestine.

D) That although surprising, that the number of microbes on the surface of our skin is even higher.

A microbiologist is a scientist who studies microscopic organisms including bacteria, algae, and fungi. Often, they study organisms that cause disease and environmental damage or are of industrial or agricultural interest. They also study the characteristics of nonliving pathogens, such as viruses and prions.

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