Gradually, __________ living things developed from the unicellular ones. (Multi-cellular, birds, fishes)
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Multi - cellular.
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Gradually, multicellular living things developed from the unicellular ones.
- Protozoa, which are unicellular organisms, are the first life forms on Earth.
- These single-celled creatures were the ancestors of multicellular life.
- As multicellular organisms eventually evolved, new types of plants and animals were created.
Evolution of multicellular from unicellular:
- Approximately 3.5 billion years after Earth's formation, or a billion years later, the first single-celled organisms were discovered on the planet.
- It took longer for more sophisticated living forms to develop; the first multicellular animals didn't exist until roughly 600 million years ago.
- An important turning point in Earth's biology was the emergence of multicellular life from simpler, unicellular microorganisms, which profoundly altered the ecology of the planet.
- However, why cells could not go back to single-celled life is one of the unsolved mysteries of multicellular animals.
Hence, gradually multicellular living things developed from the unicellular ones.
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