Which sentence best explains how a unicellular organism gets nutrients? Explain why. A. It has a digestive system that takes in nutrients

B. It takes in all its nutrients through the cell membrane

C. It combines specialized cells into tissues that take in nutrients

D. It relies on individual specialized cells to take in nutrients

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