Captura

THE LIFE CLOCK

By Bruno Mèlich
  • 65

    DINOSAURS EXTINCTION: Primates and then the Australopithecus

    DINOSAURS EXTINCTION: Primates and then the Australopithecus
  • Period: 65 to 4

    DINOSAURS EXTINCTION: (65my-4my)

    The last of the non-avian dinosaurs went extinct. So too did the giant mosasaurs and plesiosaurs in the seas and the pterosaurs in the skies.
    The cause of the mass extinction that marks the end of the Cretaceous and the beginning of the Paleogene is a scientific mystery. The extinction wiped out the dinosaurs while most mammals, turtles, crocodiles, salamanders, and frogs survived. Birds escaped. The extintion was in 65 my.
  • Period: 65 to 4

    Primates and then the Australopithecus. (65my-4my)

    Primates are remarkably recent animals. Most animal species flourished and became extinct long before the first monkeys and their prosimian ancestors evolved. The first primates did not appear until around 50-55 million years ago. They are the hominid primers that they fit. He is a subgenre of the hominids, probably of the Australopithecine biological tribe, but he can not strictly classify the genus Homo. They appeared in 4 my.
  • 200

    DINOSAURS AND MAMMALS COEXIST

    DINOSAURS AND MAMMALS COEXIST
  • Period: 200 to 65

    DINOSAURS AND MAMMALS COEXIST: (200my-65my)

    Scientists have acquired new data supporting the idea that the last ancestor shared by all living mammals walked with the dinosaurs more than 80 million years ago. The results came from a new technique used to reconstruct the course of animal evolution. They coexist in 200 my.
  • 500

    FIRST VERTEBRATES

    FIRST VERTEBRATES
  • Period: 500 to 200

    FIRST VERTEBRATES: (500my-200my)

    The first known vertebrate fossils, found at the Chengjiang locality in China, date back to the early Cambrian. These early vertebrates are small, tapered, streamlined animals showing eyes, a brain, pharyngeal arches, a notochord, and rudimentary vertebrae. They appear from 500 my to 200 my
  • 600

    MULTICELLULAR ORGANISMS AND CAMBRIAN LIFE EXPLOSION

    MULTICELLULAR ORGANISMS AND CAMBRIAN LIFE EXPLOSION
  • Period: 600 to 500

    MULTICELLULAR ORGANISMS AND CAMBRIAN LIFE EXPLOSION: (600my-500my)

    Multicellular organisms contain not just many cells, but critically they contain cells that are different from each other. Originating from a single egg, they develop into different cell types that have different functions.
    The "Cambrian Explosion" refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on Earth. They appear from 600 my to 500 my
  • 1400

    FIRST EUKARYOTIC CELLS

    FIRST EUKARYOTIC CELLS
  • Period: 1400 to 600

    FIRST EUKARYOTIC CELLS: (1400my-600my)

    Eukaryotic cells emerged from prokaryotic ancestors and emerged in a way that was difficult to analyze. No representatives of the intermediate stages have survived, nor have we left fossils that provide any direct clue. We can only study the current eukaryotic cell, which is different from any prokaryotic cell. They appeared in 1400 my.

  • OXYGEN IN THE AIR

    OXYGEN IN THE AIR
  • Period: to 1400

    OXYGEN IN THE AIR: (1800my-1400my)

    One of the oldest organisms on the Earth are the stromatolites which appeared 1800 million years ago. They are colonial microorganisms that live in some waters in Australia and other places in the world.The most important fact about them is that they transformed the primitive atmosphere.

  • LIFE APPEARS. PROKARYOTIC CELLS

    LIFE APPEARS. PROKARYOTIC CELLS
  • Period: to

    LIFE APPEARS. PROKARYOTIC CELLS: (3500my-1800my)

    The first life on Earth came in the form of a prokaryotic cell. For two billion years prokaryotic cells were the only living things on Earth and spread to almost every corner of the planet. Today they are still the most abundant and diverse. Prokaryotic cells appear in 3500 my years ago.

  • THE FIRST ORGANIC MOLECULES

    THE FIRST ORGANIC MOLECULES
  • Period: to

    THE FIRST ORGANIC MOLECULES: (4000my-3500my)

    All living things consist of organic molecules, centered around the element carbon. Therefore, it is likely that organic molecules evolved before cells, perhaps as long as 4000 my years ago.

  • EARTH'S FORMATION

    EARTH'S FORMATION
  • Period: to

    Earth’s formation: (4500my-4000my)

    One of the oldest questions for mankind is how the Earth was formed. However, no one has an exact answer. First by the best estimates it occurred 4500 my years ago before any life appeared