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Scientists know about organisms that lived in ancient times by looking at fossils. There are many different fossils out there, however, the lower you go, the more ancient it gets. For example, they have several different fossils of horses, and that’s how they can figure out how horses formed and changed over time. Same goes for penguins, with the ancient fossil of Pedro, and the present species. There are differences in the number of bones, the shape of the bone, but there are also similarities that help us figure out how they changed and what species they are.

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Scientists gather data and fossils from similar species in their time and compare them to figure out how they are related to each other. To figure out the species they are related to, they first have to get a fossil that matches the fossils in the species we have today. If the fossil matches somewhat, the scientists try to figure out how they evolved over time. For example, Pedro, the five foot tall penguin, is related to modern penguins we have today. The scientists compared the DNA in Pedro and modern penguins to see how they relate to each other.

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Scientists know about the wildlife back then because when digging  the ground they could find fossils  that could help determine what kind of animal it was and how it survived.  The scientist could tell how species change over time because when looking at the animal your could look at  their bone structure and how it changed over time like how many bones they have or how much larger they are or how the animal have changed over the many years  at depending on where the fossil is it could tell when the animal has moved over  the years

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Scientists knew about organisms long ago because of the DNA from the bones of the animals.When they dig up  the bones they send it to the lab to be studied. When they find out what animal it is. They will make a skeleton for the animal. There is evidence that animals have changed over time; one example is the horse when it went from short to tall. Over time the horse had less toes. Another example of species changing over time is humans they went from walking on four legs to two legs.

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One way that scientists know about organisms that lived a long time ago is because of fossils. When they find certain fossils they compare it to living animals and try to work out what animal it looks like or could be related to. Some evidence that scientists gathered to explain how species change over time is that they found fossils. Specifically they look at the different shapes and sizes of the bones. When each horse has a different size foot or different amount of toes that's when they know that the species has changed over time.

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Scientists know about the organisms that lived so long ago by testing old fossil records and researching their origin and also using what other researcher’s records. Scientists have gathered evidence from using old records about old fossils they had found in the past and maybe some old research that had been researched about by different scientists, so they continue with the research.

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Scientists know about organisms that lived long ago because they study fossils and can tell when the organisms appeared, when they went extinct, or how they changed over time. They can also look at the DNA from preserved remains and study them to learn more about the organism.The evidence that scientists have gathered to help explain how species formed and changed over time is fossils and preserved remains. They study fossils and preserved remains to help determine how the organisms have evolved and how they interacted with the environment.

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Scientists are able to know how long an organism lives just by looking and studying the fossils that they are able to uncover in layers of dust. Some examples that scientists gathered to help explain the species are the amount of bones, the size of the bones, the layout of the bones, and patterns that they are able to uncover in the species. All of these little details are able to show and tell the scientist what time period the species lived in, how big it was, and how it changed over time.

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Scientists knew that organisms lived long ago because of fossils that have appeared around the world. For example in China they found a 525 million year old fossil that belongs to an ancient worm like critter which is known as CardioDictyon catenulum. Scientists gathered evidence such as fossils of different animals and studied its features and shape to determine how it looked and how other similar organisms evolved from it. They also use DNA examples to figure out how they adapt to their environment and compare them to other animals that are closely related.

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You might be wondering how scientists knew about organisms that lived so long ago. Well according to National Geographic Education it states that scientists have used fossil remains to understand the different aspects of extinct and living organisms. This also helps find changes in the population. They also say that scientists use fossils to sort out how their ancestors lived and evolved overtime. Scientists use fossil records, direct observation, and comparative studies of DNA and anatomy.

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Scientists we know now knew about organisms that lived long ago due to the analysis of fossils and other geological records. The evidence that scientists gathered to help explain how different species formed and changed over time, was using the fossils from the past and comparing them to the fossils now, Which as you can see is not the same. But they had also measured different amounts of particular radioactive elements present to determine when a rock was formed or when an animal or even plant died.

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Scientists know that about organisms back then because the fossils they dug up can help them determine what type of animal or organism they have found. Fossils that scientists have found were formed differently from how organisms look today. Some fossils had more bones whilst others had less bones. Some animals head were shaped differently from how they are today. Other animals are bigger than fossils while others have lost bones and are now smaller.

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Scientist know about organisms that lived long ago because of fossils, fossils are preserved imprints of organisms that lived long ago. Some evidence that scientist gathered to explain how species formed is by looking at the fossils and the rock specimens to determine the time. Scientist determine how they changed over time by looking at similar places and seeing how the organism evolved over time. Scientist also use dating methods and special technology to help them determine how the fossils was formed.

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Scientists have knowledge of organisms that lived a long time ago by examining fossils that are deep in the ground. These fossils give a little bit of information about how they lived and what their environment was like. They have gathered enough  information to help explain how these species formed. This evidence includes fossil records, comparative anatomy, embryology, molecular biology, and biogeography. Fossils show how they formed and how they changed over time.

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Scientists know about organisms that lived so long ago by examining rock fossils between different rock layers. To figure out how long it has been, scientists can look at the layers and fossils that are found above or around it. This will make an accurate estimation on when they died. They find fossils and bring them into the lab to determine an even better estimate. One way that they can represent changes over time is by having models of the skeletal system. For example, a horse toe bones decreased as time went by.

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Scientists search for evidence of past bones, teeth, shells, footprints, shells, and even preserved plant tissue or animal tissue to find out what/who has lived during a certain time in the past years. They also use the anatomy and genetics to help find the similarities in a certain species. For example, one of the scientist's most recent fossil searches is a horned dinosaur called Lokiceratops rangiformis which was discovered in Montana. There are many more Fossils they are currently looking for.

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The reason why scientists know about organisms that lived a long time ago is because of fossilized remains left behind by plants and animals like teeth,footprints,bones or shells.Another way scientists know about organisms that lived a long time ago is by using rock dating,rock dating is when scientists study the age of the rocks in which the fossils are found which in turn gives an estimate to how old the are.the evidence that scientist gathered to help explain how species formed and changed over time are,by comparing fossils to other fossils to support the theory of how animals evolved.

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Scientists knew about organisms that lived long ago, because they researched the layers of the sedimentary rocks and the fossils there. One evidence is that Pedro is one fossil remains that scientists found. He was an organism that lived a long time ago with a similar penguin background. With more research they found out more. Pedro was in the penguin family, he was really big, with the height of 5 feet. He also had really thick and strong bone, indicating that he was a deep diver. Another evidence is that scientists found a background of horse fossils. Scientist said that these organisms were smaller, around three times smaller. With more observing and research these organism had more toes than the modern horses in today life. - Jaedyn Rumbaoa

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Scientists know that living organisms live so long because they study fossils and they find the record of time. There are also different layers of what the fossils, the lower layers are older and the higher layer are younger. They look at molecular biology and genetics, also the chemical traces from the fossil . Bio geography and anatomy shows how species formed and changed over time.

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Scientists know about organisms that lived so long ago by researching their fossils and getting evidence of life from a long time ago. With this knowledge scientists can reveal the record of history for earth, more about the organisms, how they lived and more. Scientists have gathered evidence from fossils, their genetics, their DNA, and more to combine all these information and specifically identify the organisms.