Which of these is evidence that eukaryotic genes are regulated independently instead of in units like operons? Genes use a common promoter and a common set of transcription factors.

Each gene has its own promoter, but they use a common set of transcription factors.

Each gene has its own promoters and set of transcription factors.

Genes use a common promoter, but each has its own set of transcription factors.

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