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Earth Geological tim

History of earth and Geologic time

QuestionAnswer
How old is the earth (estimation)? 4.5 Billion
Radiometric Dating The estimation of the age of an object measuring the content of certain radioactive isotopes
Half-life The time it takes for half of the radioactive elements to decay.
What have experiments show scientist about the formation of the building blocks of bio molecules? They can be formed through natural processes
What was the first living thing on earth? Prokaryotes
How did early cyanobacteria affect the earth's ecosystem? Many things evolved
current evidence supports that idea that eukaryote evolved from what type of organism? Eukaryotes
Name the organelles that are believed to be symbiotic eubacteria? Mitochondria, chloroplast
The concepts of endosmybiosis is supported by what 4 pieces of evidence? -Size and structure the same to prokaryotes -they have ring of DNA -The ribosomes have same size, and structure -The reproduce differently
Multicellular organisms first appeared on earth how long ago? 700 million years ago
These organisms are members of what group? Protists
The geologic timeline is a history of the earth that is divided into chunks based on what type of major events? -Mass extinction -Wide spread climate -new species -Major event
Created by: mhackett
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