There is only one structure feasible for a tetrahedral molecule with such a formula, under the supposition that A is in the center of the tetrahedredon. In this case X and Y are in the vertices of the tetrahedron.
If you draw several figures changing the position of the X's and the Y around the center (A), you will see that all are equivalent.
This is the case of the product CH3Cl, named chloromethane, which, for the same reason given above, does not have isomers.
The answer definitely is b. ie. exocytosis.
Exo( latin origin) means out.
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The answer is that having more mitochondria affects the cell's function by
*the cell will need more food for energy
*the cell would produce more ATP
*the cell will function faster than another cell if it has more than one mitochondria because mitochondria is the powerhouse of a cell
Hope this helps !!
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