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.

[Q]: Sentence1: Amphibians have permeable skin that easily absorbs substances from the environment. 
Sentence2: Some substances are harmful to the body and block biological systems.
[A]: substances


[Q]: Sentence1: Chordates have a complete digestive system and a closed circulatory system. 
Sentence2: animals with jaws have a complete digestive system and a closed circulatory system.
[A]: circulatory


[Q]: Sentence1: Slime molds are fungus-like protists commonly found on rotting logs and compost. 
Sentence2: True Slime Molds Slime molds are a mucus-like organism.
[A]:
Slime