Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain

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.

Which of the following best describes the relationship between glucose and complex molecules such as hormones?

Which event would lead to primary succession of a forest?