instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: All frogs are amphibians. 
Sentence2: frogs have permeable skin that easily absorbs substances from the environment.
answer:
frogs


question:
Sentence1: All chemical reactions require activation energy to get started. 
Sentence2: Catalysts lower the activation energy.
answer:
activation


question:
Sentence1: Moisturizing Secondly, moisturizing the skin is extremely important. 
Sentence2: Most aquatic organisms do not have to moisturize their skin.
answer:

moisturizing