Researchers have discovered that the ear bones of mammals are homologous structures with parts of fish jaws. this suggests that a: selection pressures have acted over time on mammals but not fish. b: selection pressures have promoted similar evolution in fish and mammals. c: fish and mammals have a distant common ancestor. d: fish do not require a sense of sound.

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

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.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays