Imagine you were to find a fossilized animal bone containing one-eighth the amount of carbon-14 present in earth’s atmosphere today. How long ago did the animal die?
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Imagine you were to find a fossilized animal bone containing one-eighth the amount of carbon-14 present in earth’s atmosphere today. How long ago did the animal die?
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- Scientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what evidence in the rock layers that scientists found to prove when the early conditions on earth had free oxygen in the atmosphere."Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 22920 years after an animal dies, ______ carbon 14 will have been replaced with carbon12 and only _____ will remain in a bone sample from the animals skeleton found by the archaeologists. " "More than 99 percent, less than 1 percent" "Three fourths (75 percent), one fourth (25 percent)" "15/16ths (94 percent), 1/16 (6 percent)" "62/64ths (97 percent), 2/64 (3 percent)"A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.
- Was there molecular oxygen in the earth's primitive atmosphere? How has that molecule become abundant?What kind of fossils were formed out of dinosaur remains and activities? Why do you say so? (Give three)What do you think geologists would find in the rock record as evidence of human life today million years later? Do you think we will leave a lot of traces and evidences of our existence in the fossil record?
- Which statement is true? Recent remains of plants or animals on topsoil are fossils. Imprints of leaves or footprints in sedimentary rock are fossils. Insects preserved in hardened tree sap are not fossils. Petrified skeletal bones from an ancient mammal are not fossilsHow the evolution of oxygen was involved in the initial evolution of terrestrial life?explaination this in 150 words each question A. What is the PROTEROZOIC LIFE? B. Discuss the Great Oxygenation Event. C. Discuss the CAMBRIAN EXPLOSION OF LIFE.
- 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?Why did ancestral mammals survive the asteroid impact while the dinosaurs did not?An abundance of___________ in Earths early atmosphere would have prevented the spontaneous assembly of organic compounds on early Earth. a. hydrogen b. methane c. oxygen d. nitrogen