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When a radio-isotope in a fossil with a half-life of 4,000 years has been reduced to 25% of its original amount, how old is the fossil?
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- -If 30 percent of the carbon-14 atoms remain in a sample, how long ago did the organism die? -Is Carbon-14 the only isotope that is used to date fossils? If not give an example of another isotope used.What are the challenges of estimating the ages of old fossils?Explain how these challenges may be overcome in somecircumstances.How do scientists determine the age of fossils?
- Was there molecular oxygen in the earth's primitive atmosphere? How has that molecule become abundant?Organism A lived from 410 to 60 million years ago. Organism B lived from 200 to 100 million years ago. Which organism will be the better index fossil? (1)How do plate tenctonics help scientist describe fossils??
- An organism dies,and its body leaves an impression in mud. Over time, the mud hardens into rock, and the impression becomes a fossil. Which kind of fossil was formed? A) cast B) mold C) original material D) trace fossilHow do we know how old a fossil is? A) We compare it to current species and see how much has changed B) We see how much soil is on top of it C) We use radiometric datingWhy would a rise in the availability of oxygen help explain why the Cambrian explosion occurred?
