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: plant requires seed dispersal for reproduction. 
Sentence2: plants are pollinated by birds.
plant

Sentence1: Ejaculation allows males to reproduce. 
Sentence2: propelling sperm from the epididymes allows males to reproduce.
allows

Sentence1: Babies that are very large or very small at birth are less likely to survive. 
Sentence2: Survival is to live, to live means hope.

survive