The Devonian period represents the fourth period of the Paleozoic era, ranging from about 420 million years to 360 million years back. This period represents the age of fishes because a variety of fish species were present and also during this time, the plants that colonized on the land areas started undergoing evolution giving rise to the formation of gymnosperms.
By the end of this period, about 360 million years ago, massive and rapid volcanic eruptions took place, that released an extensively large amount of carbon dioxide into the atmosphere. This eventually lead to a mass extinction event, eliminating nearly 80% of the total living species present on earth.
<span>Pia mater is a highly vascular tissue that cleaves
firmly to the surface of the brain and spinal cord. Pia mater protects the
central nervous system by nourishing the brain and allowing blood vessels to
pass through it. The inflammation of the pia mater can lead to meningitis</span>
