Given the task definition and input, reply with output. 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:The fertility of their hybrid has given rise to speculation that the dromedary and the Bactrian camel should be merged into a single species with two varieties . Sentence 2:However , a 1994 analysis of the mitochondrial cytochrome b gene showed the species display 10.3 % divergence in their sequences .
however