You are correct, A is the right answer.
Because there is more water outside of this cell, there will be a net movement of water into the cell - osmosis
B, the centrioles
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B. Break down dead organisms
Fungi are decomposers. they breakdown the bodies of dead organisms. They play a very important role.
I am sorry, I am not good in this area but, I found a site that could help you: http://www.chemicalelements.com/elements/ca.html
I know I am not supposed to post links but, I found help