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In what order did the following structures evolve in ancestors of humans? nucleus, multicellularity, bilateral symmetry, vert
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Answer- Nucleus,multicellularity,bilateral symmetry,notochord,vertebrate,paired appendages,lung

The presence of the nucleus is the characteristics of the eukaryota .The multicellularity is first time found in the eukaryotic aerobic animals.The bilateral symmetry was found first in the invertebrates.Then, the hollow notochord was developed first in chordata the into the vertebral column in vertebrates .Then, through the evolution paired appendages were developed in vertebrates.The ventilation lung as apart of the respiratory system first developed in amphibia and fishes.

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