BIOL 1F90- Final Exam Guide - Comprehensive Notes for the exam ( 36 pages long!)

• School: Brock University
• Department: Biological Sciences
• Course: BIOL 1F90
• Professor: Amanda Lepp

Document Summary

The universe began with the big bang about 13. 7 bya. Our solar system began about 4. 6 bya. The earth is 4. 55 billion years old. 4 bya the earth cooled enough for outer layers to solidify and oceans to form. 4 bya to 3. 5 bya first life on earth. Beginning of the earth 4. 55 bya to present. Changes in living organisms the result of. Environmental changes: can allow for new types of organisms, responsible for many extinctions. Near end of ordovician, devonian, permian, triassic, and cretaceous periods. Geologic time periods are often based on these events. Recognizable remains of past life on earth. Organisms buried quickly and hard parts replaced by minerals. Older rock is deeper and older organisms are deeper in the rock bed. Fossils can be dated using elemental isotopes in accompanying rock. Half-life: length of time required for exactly one-half of original isotope to decay.