The sum total of all the microbes in a certain environment is termed the select one: a. microbiome b. biofilm c. microbial niche d. domain e. phylogeny

The right option is; a. microbiome

The sum total of all the microbes in a certain environment is termed the microbiome.  

A microbiome is the sum total (community) of all the micro-organisms that are living together in a certain environment such as in body of humans, animals, plants and in soils. Micro-organisms (microbes) are unicellular organisms that cannot be seen with the naked eyes but can only be seen with the aid of a microscope. Examples of microorganisms include fungi, bacteria, archaea, and protists.

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you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.