Pros: 1  Works equally well in open terrain, under cover or in a gym. 2  Accurate on flat or hilly terrain and when making quick, sharp turns (e.g., when trail running or on an indoor track). 3  Lightweight design is sleeker than most GPS-enabled SDMs.
Definitions for mass extinction. Here are all the possible meanings and translations of the word mass extinction. Wiktionary(0.00 / 0 votes)Rate this definition: mass extinction(Noun) A sharp decrease in the total number of species in a relatively short period of time.
What is a possible cause of the extinction event called the Great Dying? A. a meteorite impact that killed the dinosaurs B. a great outpouring of lava at the end of the Paleozoic C. a sudden increase in the oxygen content of the atmosphere during the Precambrian D. a new kind of super predator that devoured nearly all of the life in the oceans