58:12
Bradford Seminar: "Expanding protected…
Bradford Seminar: "Expanding protected areas: What can we gain and how can we get there?"
03:02
Earth's first reefs and the beginnings of…
Earth's first reefs and the beginnings of animal life, Ryan Manzuk, GS (2306039)
Just over 500 million years ago, many of the animal forms recognized today suddenly appear in the geologic record. This rapid evolutionary event often is referred to as the Cambrian Explosion, and…