What should be true of a molecule being used as a molecular clock? . a)it has a consistent rate of neutral mutations from generation to generation.. b)it is a rare molecule that is not found in many living species that might be compared.. c)its mutations always affect the phenotype, making it easier to observe the changes.. d)it serves an unnecessary function, making it less likely to be preserved over time.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.