Prehistory can refer to the period of human existence before the availability of those written records with which recorded history begins. Fossils are the preserved remains or traces of animals (also known as zoolites), plants, and other organisms from the remote past. artifact or artefact is "something made or given shape by man, such as a tool or a work of art, esp an object of archaeological interest". A nomad is a member of a community of people who move from one place to another, either with their livestock (pastoral nomads) or subsisting on hunting and gathering. b. Kinds of evidence that archeologist and anthropologists look for to find out how people lived before written records were kept. Paleontology provided some of the first evidence for evolution at the beginning of the 19th century, when it was noted that fossils occurred in a sequential order in layers of rock. Simpler organisms occurred in lower layers, while more modern-appearing ones were always found closer to the top. Because bottom layers of rock are older than top layers, the sequence of fossils is a chronology from oldest to youngest. Thousands of rock deposits have been identified that show corresponding successions of fossil organisms; as you move from newer to older rocks, life is less like modern living things. Species found in older layers are always simpler and species in newer layers more modern. Comparative Anatomy Structures that share an embryological origin (through common descent) - even if they function in different ways - are known as homologies. Evolutionary theory predicts that species that evolved from other species should have homologous structures. This is because the original structures are modified and serve a different purpose. Biogeography - geographic patterns of species distribution Evolutionary theory predicts that groups of organisms that are evolutionarily related will also be geographically connected, if not in the present then at least at the time they diverged. For a new species to evolve from existing species, the new species must originate in relative proximity to the existing species. That is, the past and present geographic distributions of species must reflect the history of their evolution as known from fossil evidence and/or genetic analysis. Embryology is another source of independent evidence for common descent. A good example is provided by barnacles, sedentary animals that are, oddly enough, related to lobsters and shrimp. A clue to their evolutionary relationship is found barnacles' free-swimming larval stage in which they look like other crustacean larvae. And the embryos of whales, dolphins and snakes sprout . Molecular Biology Nucleic acids are the genetic material of life. It is quite conceivable that we could have found a different genetic material for each species. Yet all known life uses polynucleotides (DNA or RNA). DNA is synthesized using only four nucleotides (adenine, thymine, cytosine, and guanine) out of at least 100 found naturally. d. Stone age was given such name because during this age stone was used as tools. e.Men and women lived during the Paleolirhic Age in terms of: i. FOOD-Paleolithic hunting and gathering peoples ate varying proportions of leafy vegetables, fruit, nuts and insects, meat, fish, and shellfish. However, there is little direct evidence of the relative proportions of plant and animal foods. Although the term "paleolithic diet", without references to a specific timeframe or locale, is sometimes used with an implication that most humans shared a certain diet during the entire era, that is not entirely accurate. The Paleolithic was an extended period of time, during which multiple technological advances were made, many of which had impact on human dietary structure. For example, humans probably did not possess the control of fire until the Middle Paleolithic, or tools necessary to engage in extensive fishing. On the other...
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