BISC 102 Lecture Notes - Lecture 5: Burgess Shale, Anaerobic Respiration, Simple Living
21 Apr 2016
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Document Summary
Animals (not just mammals): multicellular, eukaryotes, chemoheterotroph that ingest/digest food: a monophyletic group. It obtains both energy and carbon by eating organic material. Endosymbiosis: many corals and anemones incorporate living algae in tissues as symbionts. 2008 discovery of east coast usa: (solar powered sea slug). Uses chloroplasts taken from its algal food source. Biological change was slow from the first 3. 5 billion years. Biological change is more dramatic in last billion years (ediacaran biota) (565-544 mya) Cambrian explosion : sudden and dramatic appearance of diverse and complex marine animals (phyla) in the fossil record (but not familiar mammals, birds, insects, plants) Aerobic respiration more efficient than anaerobic respiration and fermentation (more atp per glucose) Evolution of increased metabolic efficiency allowed for larger and active animals. Appendages for sensing prey and escaping (ex. eyes/antennas) Evidence of animals burrowing under, living on, and swimming above sea floor.
