PPT-Darwin, Evolution, and Natural Selection

Scientific Theory Social use of the word theory Not the same as in science Implies a hunch or a casual guess Scientific Theory 1 Highly probable explanation based on vast collections of scientific data. BY JESSICA ROUT. THEORY OF . Evolution!. Darwin's theory of evolution. The basic idea behind the theory of evolution is that all the different species have evolved from simple life forms. These simple life forms first developed more than three billion years ago - the Earth is about 4.5 billion years old. The timeline below shows some of the key events in the evolution of life forms on Earth, from the first bacteria to the first modern humans.. Change over time…. Geology. Began to study rock layers called strata. George Cuvier. Studied fossils. Found extinct species and noticed the deeper the fossil the more unique. Catastrophism. Charles Lyell. How would Hutton and Lyell explain the formation of the Grand Canyon. 2 . Review. What is an acquired characteristic and what role did Lamarck think they played in evolution. 3 . Review. What is artificial selection. different. species alive today. All life shares . common. characteristics. The Earth is very . old. Life. is very . old. Life has . changed. over time. The changes have been . little changes over long periods of time. Danielle Donahue. Aa. A. daptation: a well fitted feature that aids in the survival of a population. Example: the blind cave salamander has no use for eyes because they live in complete darkness. Bb. Brain Warm Up. What different ways do these animals use to move about?. What traits does each animal have that help it move about as it does?. 15-1 The Puzzle of Life’s Diversity. Humans share the earth with millions of other kinds of organisms of every imaginable shape, size, and habitat.. What is natural selection?. It’s the . process whereby organisms better adapted to their environment tend to survive and produce more offspring. . The . theory. of its action was first fully . explained . EARLY THEORIES OF EVOLUTION. DARWIN, WALLACE, & . THE ORIGIN. DARWIN’S THEORIES OF EVOLUTION. WHAT EVOLUTION IS NOT. MODERN SYNTHESIS. BIOGEOGRAPHY. SCHOOLS OF SYSTEMATICS. Early theories of natural history and classification treated living things as immutable and were . Evolutionary Ideas. A. lthough Darwin is given much credit for evolutionary theory, he was not the first person to come up with the idea.. Evolution is the change in a population over time.. The concept of evolution had been discussed for more than 100 years prior to Darwin’s theory.. A. Species overproduce offspring that may survive an environment.. B. There is little variation among members of a population.. C. Competition for resources, mates, and space among species leads to a struggle to survive.. is the process of change over time.. Evidence of evolution. . Biogeography. is the study of where organisms live now and where their ancestors lived in the past.. Patterns in the distribution of living and fossil species tell us how modern organisms evolved from their ancestors.. Charles Robert Darwin. . (1809-1882) was an English naturalist who . born on 12th February, 1809. at Shrewsbury, England. . He went on . voyage. . (trip, expedition, tour). for five years (1831 to 1836) and . What is a scientific theory?. In science, the word theory applies to a well-tested explanation that unifies a broad range of observations and hypotheses and that enables scientists to make accurate predictions about new situations.. . The process by which organism change over time. Based on science, not opinion.. Darwin. :. Evolution is descent with modification. Evolution. :. changes through time. Species accumulate difference.