5. In what ways had the Incas adapted their civilization to the environment by the sixteenth century?
a. The Incas built up large floating islands of soil to grow crops in their many lakes.
b. The Incas hunted and gathered using horses they bought from Europeans.
C. The Incas built roads and bridges to facilitate networks of exchange in mountainous areas.
d. The Incas imported potatoes and wheat from far distant trading partners to supplement
their diet.