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| The basic lower unit of classification, consisting of an ancestor–descendant lineage of populations of closely related and similar organisms. |
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| any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc. |
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4.57 - 3.8 billion years ago
many meteor impacts
oceans form and boil |
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3.6 billion years ago
life formed quickly |
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| microbial communities that mat on each other |
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reproduction
function (metabolism)
evolution ( adaptability) |
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in the oceans
hydrogen vents
extraterrestrial (crick's pan spermea)
we don't know!! |
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| DNA transcribed into RNA which is then translated into proteins |
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| takes RNA and reads it to make proteins |
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| ribonucleoprotein complex |
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| ribosome is made of many proteins nd 3 RNA |
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| capable of information and function |
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first life forms used RNA as bot information and function
we don't know!!!
in nature we found dRNA doing catalysis and naturally evolving ribozymes
RNA has been evolved in labs for specific functions, can evolve RNA to cleave and self replicate |
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| Gathering Info through Fossils for Microbial Plants |
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biased for environments (tar pit versus sand)
hard parts are more fossilized
younger rocks are more prevalent |
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Laws of stratigraphy- sediments are laid horizontally
stratigraphy superposition (old rock on bottom) |
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| percent of atoms that decay
looses half of its atoms each 1/2 life
carbon 14 is famous for dating
has a 5,700 year 1/2 life
can only use 10 1/2
[image] |
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541 million years ago
major animal phyla origin |
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251 million years ago
90% of all animal extinction
volcanism happens here
ash blocks sun for 1 million years
climate changes |
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| 65 million years ago [image] |
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| humans share a common ancestor with chimps |
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| 5 million years ago[image] |
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| last common ancestor of modern humans |
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| pattern of human evolution |
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there is no real pattern in human evolution...some Africans are more closely related to some Caucasians/Asians than other Africans
all humans derive from Africa
Africa makes up 80% of human genetic diversity |
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evolution happened to make us
WRONG!!
There are no "higher organisms" |
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(1809 - 1882)
species change over time
natural selection |
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