Only within the second of time represented by the present century has one species man acquired important power to alter the nature of his world. Considering the whole span of earthly time, the opposite impact, through which life actually modifies its surroundings, has been relatively slight. The history of life on Earth has been a history of interplay between dwelling issues and their surroundings.
153 Molecular ecology uses varied analytical methods to review genes in an evolutionary and ecological context. Molecular ecological research became more possible with the event of