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Bio 181 History of the Earth
Terms in this set (24)
where are fossils found?
working off of the geological laws of superposition, layers on top of other layers are going to be different.
One thing they noticed is different materials emitted energy and the amount varied. These elements decayed at different rates. When a radioactive element decays it converts to a different type of element.
length of time required for half of the radioactive atoms in a sample to decay
a standard time scale that divides Earth's history into 3 eons and further subdivisions
first 2 eons lasting around 4 billion years
3 eras that represent the majority of multicellular life:
Permian (250 mya)
96% of all life wiped out (biggest mass extinction event that we know about) This is associated with Pangea broke apart.
Cretaceous (65 mya)
® the study of the movement of the major crustic plates of the lithosphere float on top of the magma found in the mantle
2 types of tectonic plates
→ life developing from nonliving matter. At some point the first cell had to emerge.
Steps of chemical evolution
1. abiotic synthesis of small organic molecules
2. joining of the molecules into polymers
3. Packaging of these molecules into "protobionts"
4. Origin of self-replicating molecules ("RNA world")→ inheritance possible
Animal diversity exploded around 543 mya
Colonization of land about 500 mya
beginning of Ordovician period
Age of fishes
"Age of Amphibians"
"age of reptiles"
"age of mammals"
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Choose a word to replace the italicized word in the following sentence. All of the possible choices for the sentence have similar definitions, but the correct answer will have a connotation that best suits the context. For example, the words "delete," "destroy," and "obliterate" all mean "to remove or wipe out," but no one would ever say, "I destroyed the name from the document." The correct choice will be the word that has the best specific meaning and does not render the sentence awkward in tone or content. When choices seem close, look for a clue in the context that makes one choice better than the other. **liberty** **malevolent** **rotten** **tyrannical** **bad** **mischievous** **unpalatable** **repugnant** **autonomy** **rigid** Though he must still report to his boss once a month, Rob enjoys the *sovereignty* of working alone in a remote, Arctic research outpost. **Better word:** _______________________________
Label each word or phrase that is italicized to indicate its use in the sentence. Use these abbreviations: $subj.$ (subject), $v.$ (verb), $i.o.$ (indirect object), $d.o.$ (direct object), $p.n.$ (predicate nominative), $app.$ (appositive), or $p.a.$ (predicate adjective). \ Franklin was an inventor and a statesman.
history of the americas
Copy the chart below and compare the points of view of Federalists and Republicans. | Federalists | Republicans| |:-: |:-:| | | |
Each of the following sentences contains an error in pronounantecedent agreement. Identify each error, and then write the correct pronoun form. The band have been measured for its new uniforms.
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