History of Life on Earth and Radiometric Dating
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10 Terms
Age of Earth
4.5-4.6 billion years.
Cyanobacteria
Prokaryotes that produce oxygen through photosynthesis.
Jawless Fish
Fish with a sucker mouth, examples include lamprey and hagfish.
Bony Fish
Fish that stay in water and lay eggs in water.
Amphibians
Organisms that stay on land but lay eggs in water.
Reptiles
Organisms that stay on land and lay eggs on land.
Birds
Animals that stay on land and lay shelled eggs on land.
Mammals
Animals that are mostly found on land and have fertilized eggs that stay inside the organism.
Half-Lives
The time required for half of the radioactive isotopes in a sample to decay.
Radiometric dating
A method used to estimate the age of an object by measuring the content of radioactive isotopes.
Note 
Flashcards (44)