Molds growing indoor have the ability to reproduce and colonize building materials as long as moisture is present. When conditions change and the moisture is removed, most residual spores become dormant. The length of time that spore can remain dormant depends on the species and the environment. Ultraviolet light and high temperatures limit the survival of outdoor spores, though many species have evolved elaborate mechanisms and structures that protect spores for harsh environments. Spores contain pigments that reduce UV damage, complex carbohydrate and proteins that reduce desiccation, and mycotoxins that discourage insect feeding. Since indoor spores are not typically exposed to these inhospitable environments, they remain viable longer than their outdoor counterparts.lifecycle+of+indoor+mold (2)