Prokaryotic cells don't have a nucleus
<span>The movement along the concentration gradients allows for the cell to maintain homeostasis. Keeping a cell in the proper conditions inside and out allows for it to function properly and carry out the duties that it is required to do as part of its bodily system.</span>
The right answer is C. I think, a. and d. are obviously not serious. B is not true, because Ag and Au are in the same group in the periodic table and therefore have the same number of electrons in the last level. So, they form ions with the same charge. C is true beacause Ag and Au have different numbers in the periodic table and different amount of protons and neutrons in their nucleuses.
