Which word or phrase best describes the part of panama where the canal was built? mountainous flat cool and dry warm and dry

 The answer is mountainous.  When the French first took up the project, they were overwhelmed by landslides caused by rains and the outbreak of yellow fever caused many to fall ill.  The Americans later took over and established health measures to combat disease as well brought over new equipment and labor that led to the completion of the Panama Canal.

The answer to the question asked is 5