Which is incorrect about restriction enzymes? they are key tools that make genetic engineering possible. they are found in bacteria and eukaryotes. they produce dna fragments with "sticky" ends. a specific enzyme will always cut at the same sequence. bacteria may possess them naturally to rid themselves of viral dna?

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.