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What else can I help you with?
In which era did the dinosaurs exist?
Mesozoic but it was split into 3- Triassic, Jurassic and Cretaceous. Dinosaurs lived from the late Triassic Period, Jurassic Period and Cretacious Period. Dinosaurs died in the Late Cretacious Period 65 Million Years Ago
Dinosaurs became extinct at the beginning of the Cretaceous period?
No, dinosaus became extinct at the end of the Cretaceous Period. They ended up dying because the dust was so bad that it changed the weather, which changed the temperature and the way plants grow, which eventually killed off the dinosaurs.
Did sturgeons live when dinosaurs were alive?
True sturgeon evolved early in the Cretaceous. They have barely changed since then, making them living fossils. Today, however, many are threatened by humans.
What did the earth look like when dinosaurs were around?
Life would have been good when dinosaurs roamed the earth. Warmer than today and best of all, no grass to mow. Mostly tree ferns and some pine back then. For the early part of the age of dinosaurs, there were no flowers, at least as we would know them. They came in around 165 million years ago or later.
What subdivisions make up the geologic time scale?
The geologic time scale is divided into periods, which are then divided into epochs, which are further divided into ages. For example, the time of the dinosaurs lasted 3 periods (Triassic, Jurassic, Cretaceous), each period had 3 epochs (late, early, middle), and each age fit into one of those. Many epochs have more than 1 age associated with them. As for the basis for differentiating the eras, I'm not so sure. The only one I can say for sure is the end of the Cretaceous, which is when the dinosaurs suddenly became extinct due to a meteor impact. I think the divisions are based on significant, global-scale events that changed the world.
What happened to humans after the dinosaurs?
Dinosaurs became extinct at the end of the Cretaceous period that is almost 65 million years ago. Genus Homo evolved about 2.5 million years ago. On the other hand, we've changed the name of dinosaurs over the years; now they are called birds.
What was the environment compared to the present in the cretaceous?
The climate of the Cretaceous period was warmer and more humid than it is today. The Earth's landmasses changed during the Cretaceous and sea level was higher then than it is today.
Why have some animals not changed before the time of dinosaurs?
because not all the dinosaurs were killed some survived
What are two ways the climate has changed since the time of dinosaurs?
mammals have evolved and that climate has changed rapidly like grass, grass wasn't around in the time of the dinosaurs.
What are facts about the Cretaceous time period?
1.) mammals,amphibians,crocodiles,turtles,insects,and land plants survived the cretaceous time. 2.) 1815 was called the year without summer because the volcanic dust, propelled into the stratosphere where it couldn't get rain, sunlight. 3.) Not only was iridium common in the last Cretaceous layers, but also microtektites, which are small glass spheres characteristic of the impact of an asteroid with terrestrial rocks that contain silicon. Shocked quartz grains, characteristic of powerful impacts, were also found. 4.) All this happened, even though the global temperature decreased by only about 2°F (1½12;°C). 5.) The Cretaceous extinction changed the face of biodiversity on Earth. After the large dinosaurs were gone, many large mammals evolved as well as many small ones. 6.) The lower part of the Cretaceous System consists of six stages: the Berriasian, Valanginian, Hauterivian, Barremian, Aptian, and Albian. 7.) Early Cretaceous characteristically deltaic and lacustrine. 8.) Late Cretaceous including marine deposits, such as sandstone and the characteristic chalk, a pure fine-grained white limestone formed largely of planktonic coccoliths. 9.) As continents continued to drift apart, the climate over much of the land became cooler and drier during the Cretaceous. 10.) plants appeared, and dinosaurs and other reptiles reached their peak of development.
What was the great extinction?
The most recent one was the Cretaceous-Tertiary event, about 65 million years ago. Prior to it, reptiles were still the dominant species on earth. After it reptiles - especially the huge ones (dinosaurs) gave way to mammals as the dominant species. An event after which the distribution of earth's fauna changed dramatically.
Was cyanobacteria the first to exist or dinosaurs?
Cyanobacteria. Cyanobacteria are among the earliest forms of life and are thought to have evolved approximately 2.5 billion years ago. These bacteria are thought to have changed the atmosphere of the planet via nitrogen fixation. The first dinosaurs evolved approximately 250 million years ago during the late Triassic.
