Anasazi.
TFA ; a unit take out side fresh air to in side room / complax AHU ; a unit take inside air to conditioning air , remove heat from air , maintened temp. and give back that air to room
Different communities developed during primary succession at Glacier Bay starting with pioneer species like lichens and mosses, which helped break down rock and soil. This allowed for the establishment of grasses and herbs, followed by shrubs and eventually trees. Each stage of succession created conditions for the next stage to establish, leading to a diverse ecosystem.