What statement is true of expert testimony involving questioned documents?
A) A graphologist specializes in analysis of the physical qualities of questioned documents.
B) A forensic document examiner analyzes handwriting to determine the personality of the author.
C) A graphologist is a more respected expert witness since their analysis is scientifically based.
D) A forensic document examiner analyzes the physical qualities of documents and handwriting characteristics.

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.