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Evolution

Short Answer Type

51. Define connecting link (in regard to evolution) and give its one example from vertebrates.

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52. What is the significance of connecting links ?

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53. What are fossils ?

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54. What is radioactive -dating? State the principle behind the procedure.

Radioactive-dating -A process for determining the age of an object by measuring the amount ofa given radioactive material it contains. It is a dating method of determining the age of earth materials orobjects of organic origin based on measurement of either short lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
It is based on the principle - Each radioactive element decays at its own nearly constant rate. Once this rate is known, geologists can estimate the length of time over which decay has been occurring by measuring the amount of radioactive parent element, the amount of stable daughter elements and the amount of radioactive substances left, thus giving the age of the different things like rocks.

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