Because it is polar and it is to large to cross the membrane and because the concentration gradients are to strong so they have to be diffused.
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Answer:
You didnt give me and choices so out of the information i have from this answer i can conclude that the answer is out of these 3 Options.
1.) Phyllids 2.) Xylem 3.) Phloem
Alfred has been in warm area your answer
some of the special structures in the members of these phylum as follows:
Members of porifera are sponges. they have collar cells and cellular -level body organization. Cnidarian have stinging cells present on the tentacles around the mouth. Ctenophorans have comb-like plate cells for swimming. Platyhelminthes - members are first to have sensory and nervous tissue in the head region.
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