Once the organism dies the amount of carbon-14 decreases exponentially.
The exponential, radioactive decay of carbon 14 is used to estimate the death dates of organic material.
Living organisms have approximately the same ratio of C12 to C14 in their tissues. Once the organism dies C14 decays into nitrogen 14. Decay of C14 to nitrogen 14 changes the ratio of C12 to C14. The ratio of C12 to C14 in dead material can be compared to the ratio when the organism was alive to estimate the date of its death. Radiocarbon dating can be used on different samples such as bone, cloth, wood and plant fibers.
B. semi-permeable
meaning: it is only partly permeable, not all substances can pass through the membrane.
What do you think the answer is then I can help you change your answer around.<span />
This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
