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 device is a plastic cylinder, designed to make a metered-dose inhaler easier to use. Many people find it difficult to co-ordinate pushing down the canister of their inhaler with breathing in deeply, so a spacer device is a useful way to remedy this problem.