A scientist is comparing the outer structure of an onion cell, structure X, to the outer structure of a human skin cell, structure Y. Which generalization is true about the types of structures being examined? (A) Structure X is not living, and structure Y is living.
(B) Structure X can be found in some human cells, and structure Y can be found in some plant cells.
(C) Structure X is only found in plant cells, and structure Y is found in plant and animal cells.
(D) Structure X is semipermeable, and structure Y is selectively permeable.

the answer would be 3

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.