In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:Most species use a pulling or snapping behavior . Sentence 2:However , only D. aeneus and D. wrighti use biting as a delivery mechanism .
however

Sentence 1:If that hypothesis is rejected , one can use OLS . Sentence 2:However , if the presence of a unit root is not rejected , then one should apply the difference operator to the series .
however

Sentence 1:In some species , such as rodents , the principle neurons in the LGN receive strong inputs from the retina . Sentence 2:However , the retina only accounts for a small percentage of LGN input in these cases .

however