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Scientists use carbon-14 to date ancient fossils.
Plants and animals absorb carbon-14 produced by cosmic rays. The ratio of C-14 to C-12 is constant when they are alive.
When they die, the C-14 decays to C-12, and the ratio changes.
Carbon-14 has a half-life of 5730 years. Thus, the object loses half its C-14 every 5730 years.
Scientists can use the C-14 to C-12 ratio to date fossils up to 70 000 years old.
Answer:
They are all organic compounds
Explanation:
Methanol, ethanoic acid and glucose are all organic compound that can be found in living organisms.
Glucose is a product of photosynthesis in plants. It is also produced from digestion of food in animals.
Ethanoic acid is a product of cellular respiration that occurs where there is insufficient oxygen.
Methanol is a waste often found in urine.
These compounds can all be traced to living sources. They are called organic compounds.
