The first complex multicellular life forms with appendages, etc., appeared on Earth about 0.5 billion years ago during the

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The first complex multicellular life forms with appendages, such as legs and arms, appeared during the Cambrian Period, approximately 0.54 billion years ago. This era is known for the explosion of life forms, with an incredible diversity of species appearing in a relatively short period of time. The Jurassic Period, Mississippian Period, Precambrian Period, and Neolithic Period all occurred later in Earth's history and did not see the emergence of complex multicellular life forms with appendages.

The First Complex Multicellular Life Forms with Appendages, Etc