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you have discovered a fossil-bearing layer in east africa and you wish to estimate its age. there are abundant fossils of many savanna species, and you have identified most of them to species or genus. you know that the genus equus makes its first appearance in africa at 2.3 mya, and the species connochaetes gnou first appears at about 1.07 mya.

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There are abundant fossils of many savanna species, and identified most of them to species or genus  is known as paleontology

The conditions in this statement are If your site includes Equus but not Connochaetes gnou. If your site includes both Equus and Connochaetes gnou. If your site contains neither Equus nor Connochaetes gnou.

The study of fossils, including their age, formation process, and evolutionary importance, is known as paleontology. If a specimen is more than 10,000 years old, it is typically regarded as a fossil. The earliest fossils date back between 4.1 billion years and 3.48 billion years.  A geological timeline and the relative ages of various fossils were recognized in the 19th century as a result of the discovery that specific fossils were linked to specific rock strata. Scientists are now able to quantitatively determine the absolute ages of rocks and the fossils they contain thanks to the introduction of radiometric dating methods in the early 20th century.

Fossils range in size from microorganisms with a diameter of one micrometer (1 m) to dinosaurs and trees that were many meters long and weighed many tons. In most cases, a fossil merely preserves a small section of the extinct organism, typically the component that was partially mineralized during life, like the vertebrates' teeth and bones or the invertebrates' chitinous or calcareous exoskeletons. Additionally, fossils may include signs that the organism left behind while it was still living, such as feces or animal footprints (coprolites). As opposed to body fossils, these kinds of fossils are referred to as trace fossils.

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