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1) Alfred Wegener, in the first three decades of this century, and DuToit in the 1920s and 1930s gathered evidence that the continents had moved. They based their idea of continental drift on several lines of evidence: fit of the continents, paleoclimate indicators, truncated geologic features, and fossils.
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certain viruses are used as vectors because they can deliver the new gene by infecting the cell. the viruses are modified so they can't cause disease when used in people. some types of virus, such as retroviruses, integrate their genetic material (including the new gene) into a chromosome in the human cell.
<span>In biology a population refers to all of the
animals of the same species (or kind) living in one area. For example in
a forest ecosystem you might have a population of wolves, a population of rabbits and a population of beetles. A community refers to all of the different populations living in that specific area.</span>
