The Trek Into The Earth Kelsey Roen

Precambrian time, the time prior to 4.6 billion years ago : During this time period we see the evidence of a first type of multi-celled organism, it represents what jellyfish of today look like. The final stages of the Precambrian were known as an ice age. 3 billion years ago the Earth's atmosphere was lacking oxygen. Eukaryotic cells were formed 1.5 billion years ago.

Precambrian Era
Cambrian Explosion 541 million years ago
Paleozoic time, 542-251 million years ago: Animals move onto to land 440-410 million years ago. Mammals were evolving around 310-275 million years ago. The continents and oceans were forming around 440 million years ago.
Paleozoic Era

Mesozoic time, 252-60 million years ago: During this time we see the Permo-Triassic extinction which was roughly 250 million years ago, when this happened it wiped out nearly all life on the earth at this point but opened up a new way of living. We see the rise of all types of reptiles and some dinosaurs. The Jurassic period was full of life and dinosaur species this lasted 200-145 million years ago. The extinction of dinosaurs happened roughly 60-65 million years ago.

Mesozoic Era, (Jurassic period).
  • Cenozoic era, 65 million years ago- to present day:
  • We see the first initial rise of the Himalayan Mountains which was 50 million years ago.
  • The Woolly Mammoth was a very dominant and well known species, which were hunted until there extinction about 10000 years ago.
  • We see the evolution of Homo sapiens 200000 years ago.
  • We see many events happening within this time era, we see colonies beginning to form and thrive. One colony we see is the Mayans, who were the ones who created the calendar we famously know which was made around 3114 BC.
Cenozoic Era

Louis Pasteur, Chemist. In 1864, he discovered how to make micro-organisms stay good longer and not get infected by bad bacteria and getting rotten. He discovered the act of pasteurization.

Louis Pasteur

Robert Hooke, Scientist/ Physicist 1665. When Hooke looked at a cork through a telescope, he observed the individual parts of the object and created the name "cell" to describe one of the many things he saw when he looked under the scope.

Robert Hooke

Anton Van Leeuwenhoek, Scientist 1668-1673. Leeuwenhoek was credited for his work on the microscope and being the first to discover single-celled organisms. He was the first person to describe how these organisms work and what they look like.

Anton van Leeuwenhoek

Robert Brown, Scientist. In 1883, He was presenting a paper to a society when he announced the one part of the cell Leeuwenhoek described, was what Brown called the "cell nucleus".

Robert Brown

Joseph Jackson Lister, Scientist. In England 1830s, Lister built a better microscope. He built one that you did not have to hold up to your eye but instead one you could have a little more mobile and easy to use for everybody.

Joseph Jackson Lister
  • Analysis Questions:
  • There is evidence for evolution between different type of species. There has been proof of skeletal remains that show what certain animals used to look like and how it connects with other species. There is links between what animals used to look like and what they now look like.
  • Environment can influence the different types of animals due to the fact that is was always changing throughout the Eras, it almost never repeated how the weather was. The population of the animals depended on the weather, if there was an ice age animals had to be equipped to handle such cold conditions. The population of the animals depended on what the current environment was.
  • Living organisms alter how the Earth runs by them taking the necessary items to live and alter or use those items to thrive. They affect how much is used and how it is spread out throughout the world. The different organisms make it easy for us to view how the Earth has changed and how the animals have already affected the layers and the land.

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