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- Radiometric dating uses the decay of to to determine how old fossils of biological material are using the rate of decay. Group of answer choices 14C, 12C 14N, 12C 12C, 14N 14C, 14NTrue or false. The supercontinent pangaea formed about four billion years ago.LOOK AND ANALYZE AT THE ILLUSTRATION. THE ANSWER WILL BASED ON THE ILLUSTRATION For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
- Volcanic ash can be used to date fossil finds because each time it is expelled by an eruption it has the same relative proportions of radioactive isotopes. True or FalseFILL IN THE BLANKS Biologists most often use ____________ for radioisotope dating, but its half-life is relatively ____________. Relative dating determines the relative age of rocks/fossils by ____________ them to known older or younger layers.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)
- 69. Theoretically, radiocarbon dating (Carbon-14) can date materials that are at most 1.31 billion years. 100,000 years. 40,000 years. 5730 years. None of the aboveHow would you describe earth of millions year agoWhen 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?
- A scientist has a fossil that was found in a layer of rock close to Earth’s surface. He believes that the fossil is around 12,000 years old. Which method would best allow the scientist to confirm the actual age of the fossil? finding another fossil in a deeper layer of rock finding another fossil in the same layer of rock using carbon/nitrogen absolute dating using potassium/argon absolute datingWhich of the following steps has not yet been accomplished byscientists studying the origin of life?(A) synthesis of small RNA polymers by ribozymes(B) formation of molecular aggregates with selectivelypermeable membranes(C) formation of protocells that use DNA to direct thepolymerization of amino acids(D) abiotic synthesis of organic moleculesIn the shale unit, you find the following fossil: What is the mode of preservation of this fossil? Recrystallization Internal mold Replacement External mold Carbonization
