Walking among the top canopy in a tropical rainforest requires a. bridges suspended almost 100 feet off the ground b. bridges suspended almost 60 feet off the ground c. bridges suspended almost 20 feet off the ground d. no special conditions

he wrong the answer is C

d.  no special conditions  

Explanation:

The tropical rainforests consists of trees which exhibit an average height of 35-42 meters that is 115-137 feet and a crown diameter generally range from 13-22 meters (42-72 ft). The tallest tree may reach upto 84 meters (275 ft). Due to this reason the bridges should be formed almost at the 100 feet off the ground so that the overview of canopy can be observed from the bridge.

b brown mice / white sand dunes

condensation. good luck!