BIOLOGY 171 Lecture Notes - Lecture 12: Cambrian Explosion, Extinction Event, Adaptive Radiation
Document Summary
An evolutionary pattern in which many species evolve from a single ancestral species. Any multicelled heterotroph that ingests other organisms or their tissues, develops through a series of embryonic stages, and its motile during part or all of the life cycle. Most species have epithelial tissues and extracellular matrixes. An intermediate fossil that shows both reptile and bird characteristics. Eon extending from that life originated 3. 8 billion years ago to 2. 5 billion years ago. Fossils that preserve something of the bodily remains of an organism, whether altered or unaltered, or their impression in the enclosing sediment. A burst of evolutionary origins when most of the major body parts of animals appeared in a relatively brief time in geologic history. Recorded in the fossil record about 545-525 million years ago. Asteroid impact and/or climate change lead to the wiping out of the dinosaurs.
