Fungi generally grow as which of the following forms?

Fungi are a diverse group of organisms that can take on various forms, but the most prevalent and significant form in relation to mold growth is indeed mold. Mold primarily grows as multicellular filamentous structures called hyphae, which collectively form a mycelium. This filamental arrangement allows molds to efficiently absorb nutrients from their environment and thrive in a variety of conditions.

While yeast (another form of fungi) grows as single-celled organisms and can reproduce rapidly, it is not the primary concern when discussing fungal growth in environments where microorganisms are a problem, such as in mold remediation. Mushrooms represent the fruiting bodies of certain fungi and, although they are important, they arise from molds and are not the primary growth form. Bacteria are distinctly different organisms entirely and do not fall under the category of fungi.

Thus, while fungi can exist in various forms, the choice that best encapsulates the typical growth pattern of fungi in many environments, particularly those relating to mold issues, is mold itself.