Which Was The Dominant Group Of Animals During The Mesozoic Era?
v.10: Mesozoic Era - The Age of Dinosaurs
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What exactly is a dinosaur?
Ii dinosaurs wade through shallow waters to get to the vegetation on this island. The Mesozoic Era is the age of dinosaurs. These animals grew so large they dominated the planet. Dinosaurs were so dominant that it took a catastrophic, environment-changing event for mammals to be able to take over.
Mesozoic Era: The Age of Dinosaurs
The Mesozoic Era is literally the era of "center life." It is as well known equally the historic period of dinosaurs. It lasted from 245 to 65 million years ago and is divided into the three periods described inEffigy below. The Mesozoic began with the supercontinent Pangaea. And so, during the era, Pangaea broke upward and the continents drifted apart. The movement of continents changed climates. It besides acquired tremendous volcanic activeness.
Mass extinctions occurred at the cease of the Triassic and Cretaceous Periods. The showtime extinction paved the style for a dinosaur takeover. In the second extinction, the dinosaurs finally disappeared. At the link below, y'all can watch a video well-nigh these and other exciting events during the age of dinosaurs. http://www.youtube.com/watch?5=watgb11LOHE
The Mesozoic Era consists of the three periods described hither.
The Triassic Period: During the Triassic Catamenia (245–200 million years ago), the first dinosaurs branched off from the reptiles and colonized the country, air, and water. Huge seedferns and conifers dominated the forests, and mod corals, fish, and insects evolved. The supercontinent Pangaea started to carve up into Laurasia (today'due south Northern Hemisphere continents) and Gondwanaland (today'due south Southern Hemisphere continents). The Triassic Period ended with a mass extinction.
The Jurassic Menses: The side by side period, the Jurassic Period (200–145 million years ago), began after the mass extinction that concluded the Triassic Catamenia. This mass extinction allowed dinosaurs to flourish in the Jurassic Period. This was the golden historic period of dinosaurs. Likewise during the Jurassic, the earliest birds evolved from reptile ancestors, and all the major groups of mammals evolved, though private mammals were all the same small in size. Flowering plantsappeared for the outset time, and new insects besides evolved to pollinate the flowers. The continents continued to move apart, and volcanic activeness was especially intense. The classic Steven Spielberg motion-picture show Jurassic Park realistically depicts some of the dinosaurs nowadays during this flow: http://www.youtube.com/watch?5=Bim7RtKXv90.
The Cretaceous Flow: During the Cretaceous Menstruation (145–65 1000000 years ago), dinosaurs reached their peak in size and distribution. Tyrannosaurus Male monarch, weighed at to the lowest degree 7 tons. By the terminate of the Cretaceous, the continents were close to their present locations. Earth'south overall climate was warm; even the poles lacked ice. The period ended with the dramatic extinction of the dinosaurs.
What happened to the dinosaurs? Why did they get extinct at the terminate of the Cretaceous Period? Some scientists recall a comet or asteroid may have collided with Earth, causing skies to darken, photosynthesis to shut down, and climates to change. A collision was probably at least a contributing factor. Without the dinosaurs, at that place were many opportunities for new organisms to exploit in the adjacent era, the Cenozoic. Which living things do you think took over where the dinosaurs left off?
Summary
- The Mesozoic Era is the age of dinosaurs. They evolved from earlier reptiles to fill up niches on land, in the water, and in the air.
- Mammals also evolved but were small in size.
- Flowering plants appeared for the first time.
- Dinosaurs went extinct at the end of the Mesozoic.
Explore More than
Utilise the time slider in this resource to reply the questions that follow.
- Evolution at http://johnkyrk.com/evolution.swf.
- When did the Mesozoic Era brainstorm?
- What was the predominant blazon of animal during this fourth dimension period?
- When did placental mammals evolve? What were the first ones?
- Describe the significant event that occurred at the terminate of the Mesozoic Era.
Review
- Describe how the continents shifted during the Mesozoic Era.
- Create a timeline of major evolutionary events during the Mesozoic Era.
- Explain why scientists believe dinosaurs went extinct.
Source: https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Introductory_Biology_(CK-12)/05%3A_Evolution/5.10%3A_Mesozoic_Era_-_The_Age_of_Dinosaurs
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