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.
The omasum's main function is to absorb water and some nutrients from the digesta, and is known as the many plies, since the skin-lining in the omasum is layered, much like the pages of a book, to allow for more surface area to absorb more moisture from the digesta that entered the omasum from the rumen.