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.
What is a spacer? A spacer is a holding chamber usually made of plastic and shaped like a football or tube. It makes it easier to take asthma or COPD medication from the type of puffer called an MDI (metered dose inhaler).