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3.8 billion years ago the first beings to be on this earth were just cells or prokaryotes. The prokaryotes are a group of organisms that lack a cell nucleus, or any other membrane-bound organelles. These came around about 3.8 billion years ago.
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The timespan is not legitimentaly correct as the years are way off
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Stromatolites are layered accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (commonly known as blue-green algae). Algae came to be about 3.4 billion years ago.
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An eukaryote is an organism whose cells contain complex structures enclosed within membranes. Eukaryotes may more formally be referred to as the taxon Eukarya or Eukaryota. This came around 2 billion years ago.
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Multicellular organisms are organisms that consist of more than one cell, in contrast to single-cell organisms. To form a multicellular organism, these cells need to identify and attach to the other cells. This came to be around 1 billion years ago.
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Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms. Animals came around about 600 million years ago.
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Arthropods are the early ancestors of crustaceans, insects, and arachnids (spiders). They came to be about 570 million years ago.
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The land plants or embryophytes, more formally Embryophyta or Metaphyta, are the most familiar group of plants. They are called 'land plants' because they live primarily in rocky/earthy habitats, in contrast with the related green algae that are primarily aquatic. Land plants had come about 475 million years ago.
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Amphibians are animals the may resemble reptiles and lay their eggs in the water. Anphibians include frogs, toads, salamanders, newts and caecilians. These animals also have spines. They had come around about 360 million years ago.
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Reptiles are cold-blooded animals with scaly skin. The biggest group of reptiles is the Squamata group which includes lizards, snakes, worm lizards, etc. Reptiles appeared about 300 million years ago.
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Mammals are creatures that have hair/fur amd don't lay eggs. They are also warm-blooded (unlick reptiles) so they can move in hot and cold climate. They came on the Earth about 200 million years ago.
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Birds are animals that have feathered wings and usually are able to fly. Birds have a wide range in size, shape, and color as well as their habitat. They appeared on Earth about 150 million years ago.
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The years for these events are not the real date as the real dates would be billions of years ago
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Fish are animals that live under water amd breath using gills. Fish are the largest group of vertebrates with 32,000 species. Fish came to be about 500 million years ago.
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Insects are small creatures with six legs and three parts of the body: the head, thorax, and abdomen. They also have two antennae. These animals have the mpst species with over a million discovered.
They appeared about 400 million years ago.
