first step in biological evolution
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cal evolution encompasses three issues: (1) the fact of evolution; that is, that organisms are related by common descent with modification; (2) evolutionary history; that is, when lineages split from one another and the changes that occur in each lineage; and (3) the mechanisms or processes by which evolutionary change occurs.
The fact of evolution is the most fundamental issue and the one established with utmost certainty. During the nineteenth century, Charles Darwin (1809–1882) gathered much evidence in its support, but the evidence has accumulated continuously ever since, derived from all biological disciplines. The evolutionary origin of organisms is today a scientific conclusion established with the kind of certainty attributable to such scientific concepts as the roundness of the Earth, the motions of the planets, and the molecular composition of matter. This degree of certainty beyond reasonable doubt is what is implied when biologists say that evolution is a fact; the evolutionary origin of organisms is accepted by virtually every biologist.
The theory of evolution seeks to ascertain the evolutionary relationships between particular organisms and the events of evolutionary history (the second issue above). Many conclusions of evolutionary history are well established; for example, that the chimpanzee and gorilla are more closely related to humans than is any of those three species to the baboon or other monkeys. Other matters are less certain and still others—such as precisely when life originated on earth or when multicellular animals, plants, and fungi first appeared—remain largely unresolved. This entry will not review the history of evolution, but rather focus on the processes of evolutionary change (the third issue above), after a brief review of the evidence for the fact of evolution...
hope it helps you...
The fact of evolution is the most fundamental issue and the one established with utmost certainty. During the nineteenth century, Charles Darwin (1809–1882) gathered much evidence in its support, but the evidence has accumulated continuously ever since, derived from all biological disciplines. The evolutionary origin of organisms is today a scientific conclusion established with the kind of certainty attributable to such scientific concepts as the roundness of the Earth, the motions of the planets, and the molecular composition of matter. This degree of certainty beyond reasonable doubt is what is implied when biologists say that evolution is a fact; the evolutionary origin of organisms is accepted by virtually every biologist.
The theory of evolution seeks to ascertain the evolutionary relationships between particular organisms and the events of evolutionary history (the second issue above). Many conclusions of evolutionary history are well established; for example, that the chimpanzee and gorilla are more closely related to humans than is any of those three species to the baboon or other monkeys. Other matters are less certain and still others—such as precisely when life originated on earth or when multicellular animals, plants, and fungi first appeared—remain largely unresolved. This entry will not review the history of evolution, but rather focus on the processes of evolutionary change (the third issue above), after a brief review of the evidence for the fact of evolution...
hope it helps you...
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