Question

fill in the blank question
media that contain at least one ingredient that is not chemically definable are called □ or nonsynthetic.
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Explanation:

In microbiology (a subfield of Biology, which is part of Natural Science), culture media can be classified. Complex media (also called non - synthetic or undefined media) have ingredients that aren't chemically definable, like extracts from plants or animals. So the term that fits here is "complex" (or "undefined" can also be used, but "complex" is more common in this context).

Answer:

complex