Answer:
it can be mitochondrion or ser
Are you asking which cell is referred to as a sugar factory? That would be (in plant organisms) chloroplasts
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Your question was.... "What layer of the blood vessel wall is composed of areolar connective tissue containing elastic and collagen fibers"
Your answer is the Tunica intima, Because, The blood vessel's tough outer layer is made up of connective tissue, which permits it to withstand stresses occurring on the vessel wall. It also contains strong collagen fibers that help bind the blood vessel to surrounding tissues, providing stability to the vessel.
I really hope this helps! :)
They would have to experiment on the different types of plants and put them in different environments to test there's physical features but before that they have to make an hypothesis of what would happen and analyze