Many years ago, tree-climbing, leaf-eating iguanas migrated from the mainland of South America to the Galapagos
Islands. The only food available was algae that grew on the rocks in the water near shore. Scientists believe that
the iguanas that survived were those that could swim well, cling to slippery rocks with large claws, and eat a new
diet. What type of adaptation is this?
A. Crossbreeding
B. Natural selection
C. Selective breeding
D. Occasional mutation
