Anthro quesitons! 1.Examine, draw/diagram, and describe at lest three the follow

Question

Anthro quesitons!

1.Examine, draw/diagram, and describe at lest three the following synapsids/stem mammals. Note diet (carnivorous, herbivorous, notable physical features and/or unique adaptaions.

A. Dimetrodon (sail back predators of the Early Permian - Texas Red Beds)

B. Scutosaurus (tank-like herbivorous pariesaur from the Late permian)

C. Dicynodonts (herbivorous therapsids of th late Permian)

2. Explain what scientist think caused the mass extinction (Great Dying) at the end of the Permian Period (last Earth time unit of the Paleozoic)?

Explanation / Answer

Many geologists and paleontologists contend that the Permian extinction occurred over the course of 15 million years during the latter part of the Permian Period (299 million to 252 million years ago). However, others claim that the extinction interval was much more rapid, lasting only about 200,000 years, with the bulk of the species loss occurring over a 20,000-year span near the end of the period. The Permian extinction was characterized by the elimination of over 95 percent of marine and 70 percent of terrestrial species. In addition, over half of all taxonomic families present at the time disappeared. This event ranks first in severity of the five major extinction episodes that span geologic time.

Causes of mass extinction

Alteration of the carbon cycle,temperature crises,population explosion of methane producing microbes,plate movements,meteoritic or comet impact.

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