What is a word, phrase, or statement that links one sentence to another by referring to previous words?

What do the components of a liquid O2 bulk storage tank include?

1. Inner and outer steel shells, separated by a vacuum 2. Safety system that vents O2 if warming occurs 3. Vaporizer system that converts liquid O2 to gas 4. Pressure-reducing valves to lower pressure to 50 psig a. 1, 2, and 3 only b. 2 and 4 only c. 1, 2, 3, and 4 d. 3 and 4 only

Wet clothing ____ the clothing.

A. reduces the protective insulation of B. enhances the protective insulation of C. reduces the weight of D. reduces steam burns from