Which of the following could be considered a reliable source of scientific information? a. a scientist's presentation of experimental results at a scientific conference. b. a sales representative's glowing description of the benefits of a new drug. c. an elected politicians claims concerning the validity of a scientific study. d. a newspaper reporter's article about the results of a secret experiment.

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How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?