Detailed Instructions: 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.
Problem:Sentence 1:The shapes and unusual spider appearance of these features have stimulated a variety of scientific hypotheses about their origin , ranging from differences in frosting reflectance , to explanations involving biological processes . Sentence 2:However , all current geophysical models assume some sort of geyser - like activity .
Solution:
however