Question

during dehydration synthesis:
water is added to break down molecules
water is removed to join molecules together
carbon dioxide is released
oxygen binds to hydrogen to form water

Explanation:

Dehydration synthesis is a chemical reaction. In this reaction, a water molecule is removed. This removal helps in joining smaller molecules (monomers) together to form larger molecules (polymers). For example, when glucose molecules form glycogen, dehydration synthesis occurs. The option "Water is added to break down molecules" is hydrolysis. "Carbon dioxide is released" is not the key feature of dehydration synthesis. "Oxygen binds to hydrogen to form water" is a general description of water formation but not specific to the process of joining molecules in dehydration synthesis.

Answer:

Water is removed to join molecules together