Theory A) Many years ago, elephants fed primarily from bushes that laid low to the ground. They had a short snout of a few inches that they used to place leaves in their mouth. However, after a great flood wiped out many shrubs, elephants had to adapt to their new environment to survive. They used their snouts to reach higher and higher for leaves, and eventually their snouts grew into longer trunks. This adaptation was then passed on to their offspring, which also continued to stretch and elongate their trunks until they developed into the structures we know today. Theory B) Many years ago elephants had primarily short snouts. Though all snouts were only a few inches long, some elephants had longer snouts than others. After a great flood wiped out many shrubs, the elephants with the shortest snouts died out because they were not able to reach enough leaves on trees. The other elephants survived and those with the longest snouts were able to survive the best and reproduce the most. Over time as the elephants with the longest trunks continued to survive and reproduce the most, and those with the medium or short trunks reproduced less, the population changed and ultimately contained only the long-trunked elephants we know today.

Does this theory ( Theory A) demonstrate Lamarckian evolution or natural selection? Justify your answer.

Does this theory ( Theory B ) demonstrate Lamarckian evolution or natural selection? Justify your answer.