Dinosaurs

The biggest non-long necked dinosaur is likely the Spinosaurus, which could reach lengths of up to 50-60 feet and weigh around 7-20 tons. Another contender is the Giganotosaurus, which was similar in size to the T. rex, reaching lengths of around 40-45 feet.

The Cretaceous-Tertiary extinction event, also known as the K-T extinction, resulted in the mass extinction of non-avian dinosaurs along with many other species. It is believed to have been caused by a combination of factors, including a massive asteroid impact and volcanic activity, leading to significant environmental changes. This event paved the way for the diversification of mammals and eventually the rise of humans.

Ankylosaurus, like other land animals, walked. They walked on all four of their short legs, and were relatively slow. This wasn't a problem because its bony armor and tail club made it impossible for a predator to attack it.

Yes, there is evidence that suggests meteors did hit the Earth during the Jurassic era. Some scientists believe that a meteor impact may have contributed to the mass extinction event that marked the end of the Jurassic period.

On the geologic time scale, an era is longer than a period. There are 12 geologic eras in total and they are composed of geologic periods. For instance, the Mesozoic era is composed of the Triassic, Jurassic and Cretaceous periods.

Considering that most eukaryotic cells have mitochondria and that dinosaurs are eukaryotes like all other animals that ever lived, it is certain that they did have mitochondria in their cells. In fact, birds are considered dinosaurs (they certainly descended from dinosaurs) and their cells have mitochondria, so we can be as sure as scientifically possible that dinosaurs indeed did have mitochondria.

Spinosaurus was mainly piscivorous, as you probably know, but fish were certainly not the only food source for Spinosaurus. It was probably capable of taking down small-medium sized prey like the Iguanodont, Ouranosaurus. However, larger animals like Paralititan or Aegyptosaurus, were probably too large for Spinosaurus too take down. Even Carcharodontosaurus, which was specifically adapted for taking down large sauropods, would need help from several other members of the same species. When hunting other dinosaurs, Spinosaurus may have grappled the prey with it's huge arms then bit into the prey and thrashed it's head back and forth, using it's long neck.

To calculate the age in million years, you would divide 0.002 by 1 million: 0.002 / 1,000,000 = 0.000000002. This value represents the age in million years based on the isochron slope.

Well I'm not sure but the only thing that I know about dinosaur eggs that they are big and not sure if bird or reptile eggs are big

The name of a long-tailed herbivorous bipedal dinosaur is a Hadrosaur, also known as duck-billed dinosaurs. They were characterized by their beak-like mouths and rows of teeth, and they lived during the Late Cretaceous period.

It is estimated that there are thousands of dinosaur fossils that have been discovered but have not yet been fully studied or researched. These fossils may be in museum collections or stored in research institutions waiting to be examined by paleontologists.

27000 years ago was approximately 25000 BCE.

The Mesozoic Era is divided into three periods: the Triassic, Jurassic, and Cretaceous periods. The Triassic period occurred from about 252 million years ago to 201 million years ago. It was a time of significant evolutionary changes, including the diversification of reptiles and the rise of the dinosaurs.

Sure, of course. Millions of years ago, tectonic plates were shifting just as they are today, and shifting tectonic plates can and do cause earthquakes, therefor earthquakes did occur millions of years ago.

No, mammoths did not exist in the Jurassic period. Mammoths lived during the Pleistocene epoch, which began around 2.6 million years ago and ended about 11,700 years ago. The Jurassic period occurred between 201.3 million years ago and 145 million years ago.

Yes, spiders were already present on Earth 400 million years ago during the Devonian period. Fossil records show evidence of early spider ancestors dating back to this time, suggesting that spiders have been around for a very long time.

During the time of the dinosaurs, Florida was underwater, meaning that dinosaurs (which are land based) were not present to be buried and become fossils. However, fossils of marine reptiles that lived at the same time such as Plesiosaurus can be found in Florida.

The Paleozoic era represents the longest timespan from the list. It ran from 542 to 251 million years ago, a total time of 291 million years.

It is also worth noting that an era always represents a longer timespan than a period and in fact an era will be composed of a number of periods.

For completeness, the other time spans mentioned in the question are given further detail below:

The Mesozoic era ran from 251 to 65.5 million years ago. A timespan of 185.5 millions years

The Carboniferous period ran from 359.2 to 299 million years ago, A timespan of 60.2 millions years. The Carboniferous period is one of the subdivisions of the Paleozoic era.

The Jurassic period ran from 199.6 to 145.5 million years ago. A timespan of 54.1 millions years. The Jurassic period is one of the subdivisions of the Mesozoic era.

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According to modern scientific theory, all the remaining dinosaurs went extinct during or shortly after the asteroid hit the Earth 65 million years ago.No evidence of a large meteorite

hitting the Earth.

We are currently in the 21st century. We entered the 21st century in 2001.

79 million years ago, during the Late Cretaceous period, the Earth was much warmer than it is today. The climate was generally hot and humid, with high levels of carbon dioxide in the atmosphere contributing to a greenhouse effect. There were no polar ice caps, and sea levels were much higher than they are now.

It has numerous crevices in the face of the Earth as well as the rocks that have been found by archeologists that contain radiation not found on earth and when you find an area that was hit by a large meteor it the debris is spread out over a very large distance showing it had to be broken up and dispersed somehow.

Giant ferns and club mosses.

The extinction of the dinosaurs is one of the many events that allowed humans to evolve. After the dinosaurs died out, mammals began to occupy the world they left behind. Mammals grew and diversified, spreading throughout the Earth, and eventually giving rise to humans.

According to Alfred Wegner, a German meteorologist, the theory of continental drift took place where all present continents broke down from the super continent 'Pangea" and got restored to their present places some 300-250 million years ago