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.
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Question: Sentence1: a battery converts chemical energy into electrical energy.
Sentence2: A battery produces a flow of electrons.

Answer: battery

Question: Sentence1: when a river floods , that river deposits soil in flood plains.
Sentence2: when a river floods, it deposits soil in generally marshy areas.

Answer: deposits

Question: Sentence1: Placental mammals give birth to relatively large and mature infants.
Sentence2: Cows, horses, dogs, cats and people are all placental mammals.

Answer:
Placental