BIOA01H3 Lecture Notes - Lecture 7: Dinos, Nanometre, Diatom

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

Prediction 1: we should see evidence in fossil records of simplest organism. Fossil record occurs when organismal features are preserved long after death: tissue to stone; trace fossils; lack of oxygen. Geological strata arranged in order formed: oldest is the deepest, geological processes may move strata after formation. Fossils is particular strata represent relative age: radiometric dating from isotope half-life provides absolute age, example: plant absorbs carbon dioxide. Turkey bones become hunting tools and these tools get found years later. As soon as turkey is dead it releases radioactive isotope of carbon called. Rate of release and half-life of c14 is known. Can be estimated when the tool was made by looking at how much c14 is left in tool. Earliest detectable lifeform is cyanobacteria (3. 4 billion years old and 1 billion years after earth formed: the(cid:455) did(cid:374)(cid:859)t get repla(cid:272)ed, the(cid:455) are still fou(cid:374)d (cid:271)ut are (cid:271)e(cid:272)o(cid:373)i(cid:374)g (cid:373)ore (cid:272)o(cid:373)ple(cid:454) Prediction 2: if evolution occurred in lineages, and lineages sometimes split.