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The Paleozoic Era (542 - 251 Ma) was divided into 6 geologic periods. Each was dominated by different types of animals.
The Cambrian Period (542 - 488 Ma)
The start of the Cambrian was marked with the extinction of the first multi celled animals. This period saw the rise of invertebrate arthropods. Ammonites and giant scorpions such as Giganatis came to dominate Earth. This was also the period fish 1st evolved but they lived securely in the shadow of the more dominant arthropods. This period also was the 1st animals to walk on the land. Evidence from tracks left by arthropods show that they at times left the water to walk on the land.
The Ordovician Period (488 - 443 Ma)
The Ordocivian was still dominated by the Arthropods. Ammonites had died out but replaced with Trilobites. The period also marked the 1st armoured fish, the ostracoderms.
The Silurian Period (443 - 416 Ma)
Although the Silurian was probably still dominated by the arthropods, the armored fish were becoming more and more dominant.
The Devonian Period (416 - 359 Ma)
Known as the "Age of the Fishes" the Devonian was for the 1st time the vertebrates broke the dominance of the arthropods. Armored fish became the most dominant sea creatures. This period also saw the first land vertebrates firstly lung fish and later the first amphibians.
The Carboniferous Period (359 - 299 Ma)
Due to a very high concentration of oxygen in the atmosphere, land arthropods saw something of a resurgence. Giant dragonflies, Spiders and a 2 meter long centipede called Arthropleura were dominant. They had to share the dominance with giant amphibians. The oceans were dominated by giant fish. This period saw the first reptiles.
The Permian Period. (299 - 251 Ma)
The last of the periods of the Paleozoic, the Permian was dominated by Reptiles. Synapsids (mammal like reptiles) became the most dominant land animals. These primitive ancestors of mammals were to dominate the land right up until the late Triassic period in the Mesozoic Era when they were replaced by dinosaurs as the most dominant land creatures. The oceans were still dominated by fish.
What else can I help you with?
What are two major biological events in mesozoic era?
The Rocky Mts. Formed and Pangea started to break apart
Which eras ended with a mass extinction?
Two major eras that ended with mass extinctions are the Permian-Triassic extinction event, which marked the end of the Permian period, and the Cretaceous-Paleogene extinction event, which marked the end of the Cretaceous period. These events had profound impacts on life on Earth, leading to the loss of a significant number of species.
What do you call a major regional group of distinctive plant and animals communities best adapted to the regions physical natural environment?
habitat
What happened at the end of the Mesozoic era but did not happen at the end of the Paleozoic era?
There were major asteroid impacts.
The three eras within the Phanerozoic eon are Paleozoic (ancient life) (middle life) and Cenozoic (recent life).?
The Phanerozoic eon is divided into three major eras: Paleozoic, Mesozoic, and Cenozoic. The Paleozoic era, known as the age of ancient life, saw the emergence of diverse marine organisms and the colonization of land by plants and animals. The Mesozoic era, often referred to as the age of reptiles, is characterized by the dominance of dinosaurs and the evolution of early mammals and birds. Finally, the Cenozoic era, known as the age of recent life, encompasses the rise of mammals and birds, leading to the current diversity of life on Earth.
What major ethnic group dominated colonial New Hampshire in the 1700s?
It was the indians.
What group of animals came before the amphibians?
The major croup that came before animals arrived on this planet would be the Dinosaur group these animals were first on the planet known to man.
What is the first major group to develop a true coelom?
exists in all animals.
What major geographic event took place during the mesozoic?
Cretaceousjurassictriassic
What were the major evolutions during the mesozoic era?
That is a trick question.Evolution never occurred.
What is the correct order for the major geological eras?
Precambrian Era Paleozoic Era Mesozoic Era Cenozoic Era
What happened at the end of the mesozoic era but not at the end of the Paleozoic era?
There were major asteroid impacts.
What are two major biological events in mesozoic era?
The Rocky Mts. Formed and Pangea started to break apart
Arrange the four major geologic eras in the correct order from oldest to most recent?
Precambrian, Paleozoic, Mesozoic, Cenozoic. :)
What happened at the end of the mesozoic era but did not happen at the end of paleozoic era?
There were major asteroid impacts.
What happen at the end of the mesozoic era but did not happen at the end of paleozoic era?
There were major asteroid impacts.
What major geographic event took place during the Mesozoic Era?
One major geographic event that took place during the Mesozoic Era was the breakup of the supercontinent Pangaea. This breakup led to the separation of landmasses that eventually formed the continents we recognize today.
