Which of the following best describes an ecosystem? a. all the living organisms in an area b. all the living organisms in an area and their physical surroundings c. a region with a distinct climate d. all the living organisms of the same species throughout the world

This class has taught you that the use of science and medicine in practical ways has become an international endeavor. one of the greatest examples of an international science accomplishment is which allows the profiling of human dna, useful not only to science but also medicine. a) forensic science b) the fbi c) the human genome project d) bioterrorism

Which statement is a physical property? becomes moldy quicklyeasy to digestconducts electricity poorlydoes not burn

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.