What is a key difference between an electrolytic cell and a voltaic cell? a.) the anode is where the oxidation takes place. b.) the cathode is where the reduction takes place. c.) there are two half-reactions. d.) there is an outside energy source. e.) the electrons move from the anode to the cathode.

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.