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.

Sentence1: Mating is generally preceded by courtship. 
Sentence2: Mating is generally similar across species.
Mating

Sentence1: Mammalian predators include the coyote and bobcat. 
Sentence2: a coyote's teeth is important for digestion.
coyote

Sentence1: Marshes and swamps are wetlands. 
Sentence2: Marshes and swamps are extremely important biomes.

Marshes