I think the correct answer would be the first option. It is the carbohydrates that is used as markers by cells to help recognize each other. Sugar chains are being used by the cells which are found on the outer membrane to help identify other cells.
I think it is D: back muscles.
Answer:
Explanation:
rocks moves mainly because of sea current if you are reffereing to the ones near ocean
if you are not referring to the ones near the ocean then no they do not move they only move if a human or onject moves it it has no support to even move the only rock that can be moved is called Sailing stones (also called sliding rocks, walking rocks, rolling stones, and moving rocks) are part of the geological phenomenon in which rocks move and inscribe long tracks along a smooth valley floor without animal intervention.
