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: Faster metabolism means more calories consumed, and usually, weight loss. 
Sentence2: mammals generate heat by consuming calories.
answer:
calories


question:
Sentence1: Water is essential for all life on Earth. 
Sentence2: H2O is needed for all life on Eartth.
answer:
Earth


question:
Sentence1: Aquatic ecosystems can be classified as freshwater or marine . 
Sentence2: Algae play significant roles in freshwater and marine environments.
answer:

freshwater