GEOL 1003 Chapter : Chapter 7 8 And 10, Test 1
Document Summary
Chapter 7 (reading assignment 218-238) existing species . : universal common descent- is the hypothesis that all living, terrestrial organisms are genealogically related. Is it tree of life or bush of life : tree of life- how earth has evolved over a very long time, bush- looks more like a bush. What can cause a sudden increase in new species of animals: hexacoral: rapid growth of (porous) skeleton and symbiotic relationship with algae. Makes them extremely powerful in taking over the underwater: rodents: two gnawing front teeth that kept growing. This caused them to start biting on things, made them hard working. Eventually they began cutting down trees/ building damns: fishes: toes evolved from paddle-like fins--dual purpose limps (swimming and walking). This was so they could escape predators the weak one would get caught by predators. All land animal"s ancestors came from marine environments.
