What conditions would most likely cause a decrease in the salinity of ocean water?
a. freezing of glaciers
b. a river flowing into the sea
c. extremely hot weather
d. high rates of evaporation

The correct answer is B. 

Freezing of glaciers would do absolutely nothing to the salinity, as for hot weather and evaporation would leave behind the salt and thus INCREASING the amount of salt to water in the ocean. 

When partially digested carbs reach the colon, bacteria convert part of that food into hydrogen and carbon dioxide gasses