题目选项分析

Although when a hagfish is threatened, it will secrete slime that is small in quantity,it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.

Although the slime secreted by a threatened hagfish is small in quantity,it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.