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.

[EX Q]: Sentence1: Bees feed on nectar and pollen. 
Sentence2: Plant reproduction often requires bees and nectar.
[EX A]: Bees

[EX Q]: Sentence1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. 
Sentence2: If Someone Is Hyperventilating Hyperventilation is caused by breathing too deeply, too fast.
[EX A]: breathing

[EX Q]: Sentence1: Plants release oxygen during the day but not during the night. 
Sentence2: Algae produce oxygen during the day through photosynthesis.
[EX A]:
oxygen