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Regardless of seeming like a somewhat stable place, the Earth's surface has changed considerably over the past 4. Mountains have been built and eroded, continents as a consequence oceans have moved terrific distances, and the Blue planet has fluctuated from creature extremely cold and verging on completely covered with hoarfrost to being very thaw out and ice-free.
These changes typically occur so at a snail's pace that they are only just detectable over the time of a human go, yet even at that instant, the Earth's exterior is moving and changing. As these changes beget occurred, organisms have evolved, and remnants of more or less have been preserved such as fossils. A fossil be capable of be studied to arbitrate what kind of structure it represents, how the organism lived, and how it was preserved. After all, by itself a relic has little meaning save it is placed contained by some context.
The of the fossil have get to be determined so it can be compared on the road to other fossil species beginning the same time age. Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.
To example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years. Close to comparing fossils of not the same primate species, scientists container examine how features changed and how primates evolved through time.
However, the age of each remnant primate needs to be determined so that fossils of the same stage found in different parts of the world also fossils of different ages can be compared. Readily available are three general approaches that allow scientists headed for date geological materials in addition to answer the question: Fifty year old woman.