Q. No.Invertebrates were formed and were active by the time of:
1. 200 mya 2. 300 mya 3. 400 mya 4. 500 mya
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| 1. | 500 mya | 2. | 350 mya |
| 3. | 320 mya | 4. | 300 mya |
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| 1. | Seymouria | 2. | Peripatus |
| 3. | Cartilaginous fishes | 4. | Coelocanths [lobe-finned fishes] |
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| 1. | Pelycosaurs | 2. | Synapsids |
| 3. | Tuataras | 4. | Thecodonts |
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| 1. | Carboniferous | 2. | Jurassic |
| 3. | Cretaceous | 4. | Tertiary |
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| 1. | Pareiasaurus | 2. | Pelycosaur |
| 3. | Ichthyosaurus | 4. | Archosaurus |
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