Some geographers estimate that around 300 c. e., polynesians may have reached the western coast of where they learned about the sweet potato.
a. south america
b. africa
c. north america
d. australia

The correct answer is A. South America

Some geographers estimate that around 300 C.E., Polynesians may have reached the western coast of South America, where they learned about the sweet potato. It has never been completely proven, but there is a lot of evidence in favor of this theory.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen