The sponges or poriferansare animals of the phylum Porifera. They are primitive, sessile, mostly marine, waterdwelling filter feeders that pump water through their matrix to filter out particulates ... > more
Ancient Rome was a civilization that grew out of the city-state of Rome, founded on the Italian peninsula around 800 BC. During its twelve-century existence, the Roman civilization shifted from a ... > more
Mastodons or Mastodonts are members of an extinct genus Mammut of the order Proboscidea; they resembled, but were distinct from, the woolly mammoth. While mastodons were furry like woolly mammoths, ... > more
Sequence stratigraphy is a relatively new branch of geology that attempts to link prehistoric sea-level changes to sedimentary deposits.
The 'sequence' part of the name refers to cyclic sedimentary ... > more
The horseshoe crab (Limulus polyphemus) is an arthropod that is more closely related to spiders than crabs. Horseshoe crabs possess the rare ability to regrow limbs lost. Limulus has been extensively ... > more
Nebkheperre Tutankhamun (alternate transcription Tutankhamen), named Tutankhaten early in his life, was Pharaoh of the Eighteenth dynasty of Egypt (ruled 1334 BC - 1325 BC), during the period of ... > more
Global warming refers to the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.
The global average air temperature ... > more
The Cenozoic Era is the most recent of the four classic geological eras. The Cenozoic is divided into two periods, the Palaeogene and Neogene, and they are in turn divided into epochs. The Palaeogene ... > more
Tyrannosaurus is a genus of tyrannosaurid theropod dinosaur. The species Tyrannosaurus rex, commonly abbreviated to T.rex was one of the largest land carnivores of all time. It hails from what is now ... > more