Timeline for A planet *without vertebrates. (*mostly, restrictions apply)
Current License: CC BY-SA 4.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 17, 2023 at 12:05 | comment | added | MichaelK | Stephen J Gould, in his book on the Burgess Shale, and the discovery of Pikaia Gracilens — a very early chordate prototype — concluded that all that was needed was that Piakia did not survive the Cambrian Explosion and instead became an evolutionary dead end, then there would not have been vertebrates. en.wikipedia.org/wiki/… | |
| Jun 17, 2023 at 10:40 | history | answered | Ichthys King | CC BY-SA 4.0 |