A piece of DNA codes for a protein. Which of the following mutations is most likely to result in the smallest change in the protein for which piece of DNA codes? * a) Substitution of the first base in the sequence
b) Substitution of the third base in the sequence
c) Deletion of the first base in the sequence
d) Deletion of the third base in the sequence

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.