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Precambrian Era
4.6 billion-544 million years ago
4.6 billion-544 million years ago
GEOLOGIC EVENTS
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Earth formed about four point six billion years ago. It formed from a solar nebula. A solar nebula is a cloud of dust and gas in outer space. A star exploded in Outer Space and the wreckage from the explosion then crashed into a nearby cloud of gas, bringing together the ingredients to form Earth.
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The ocean was formed roughly about for billion years ago. It was formed by water when it gradually began to accumulate and eventually it created an ocean. Also when it rained it created large puddles that once became an ocean.
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The oldest rocks was found in Greenland. The first sedimentary rock was formed about four billion years ago. They were formed when lava turned into the first sedimentary rock. Then they seeped through the Earth and formed rocks.
LIFE EVENTS
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The Prokaryotic cells are missing a nucleus that is why there are called "simple cells". The definition of a nucleus is the central and most important part of an object, movement, or group, forming the basis for its activity and growth. An example of a prokaryotic is bacteria.
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An Eukaryotic cell is a complex cell. It is complex because it has a nucleus. A nucleus is the central and most important part of an object, movement, or group, forming the basis for its activity and growth. An example would be algae. That is why they call it a complex cell.
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The Jellyfish-like animal is known for its multicellular organisms. They have many cells instead of just one.Multicellular organisms are organisms that consist of more than one cell, in contrast to single-celled organisms. To form a multicellular organism, these cells need to identify and attach to the other cells.
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An arthropod is an invertebrate animal that consists of insects and crustaceans. An invertebrate animal is an animal lacking a backbone, such as an arthropod, mollusk, or annelid. It has an exoskeleton, a segmented body, and jointed appendages. Arthropods are members of the phylum Arthropoda, and include the insects, arachnids, and crustaceans.
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The mass extinction happens at the end of each era. At the end of the precambrian era 80-90% of the species went extinct. Th first one ever to occur happened at the end of the precambrian era. This era is known for starting the first cell and having earth form as one whole.