The answers are A and F.

The sentence talks about the incredible diversity of microbes but also notes that specific body sites tend to host a few specific bacteria. This indicates that there is some organization or pattern in the distribution rather than a completely random or uniform spread. Therefore, "haphazardly" and "randomly" fit the context well. Haphazardly suggests a lack of order, and randomly suggests a lack of pattern, both of which align with the idea that the distribution is not organized. Hence, the correct answers are A (haphazardly) and F (randomly).

A. Haphazardly: This term implies a lack of order or planning. If the distribution of microbes were haphazard, it means there would be no specific pattern or organization in how they are distributed, which is the opposite of the case in the question wherein there is a specific pattern. Hence, this option fits.
B. Uniformly: This term suggests an even distribution throughout. If the microflora were uniformly distributed, it would mean that all body sites have a similar concentration of microbes. However, this option does not mention anything about specific patterns.
C. Effectively: This term does not directly relate to the distribution of microbes. It suggests achieving a desired result, but it's not suitable in the context of describing how microbes are spread across the body.
D. Heterogeneously: This term implies a diverse or varied distribution. If the body's microflora were heterogeneously distributed, it means different body sites have different kinds of microbes.
E. Functionally: This term is not directly related to the physical distribution of microbes. It implies something related to function, and in this context, it doesn't fit the description of how microbes are spread across the body.
F. Randomly: This term suggests a lack of predictability or pattern. If microbes were distributed randomly, it means there is no specific order or arrangement in their distribution, which is the opposite of the case in the question wherein there is a specific order. Hence, this option fits perfectly.