The American black bear lived during the same period as short-faced bears (Arctodus simus and A. pristinus) and the Florida spectacled bear (Tremarctos floridanus). These Tremarctine bears evolved from bears that had emigrated from Asia to North America 7â8 ma.
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
Letâs start with a brief physiology review. Taking up space The pleural space is a potentialspace between the visceral pleura,the outer lining of the lung, andthe parietal pleura, the inner liningof the thoracic cavity. These twosurfaces are separated and lubri-cated by a thin fluid thatâs pro-duced by the cells of the pleura.