Explore the gene expression dataset in Gene Expression Omnibus (GEO) with the accession GSE4115. In this study, the authors compared the gene expression in histologically normal bronchial epithelium in 79 samples from smokers with lung cancer with 73 samples from smokers without lung cancer. The goal of the study was to identify a diagnostic gene expression profile that can distinguish between lung cancer and non-lung cancer samples.

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas