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.
A Spacer is a fastener that is used to create space between two objects, often to properly position them. In the world of electronic components and electronic hardware, spacers are typically used to space circuit boards, panels, doors or gears. Spacers can be round or hexagonal in shape and can have swage characteristics.