The correct answer is (c.) outer. The moon's average density is about the as the outer layer of the Earth. The average density of moon is about 3.34 g/cm<span>3 and the earth's outermost layer is almost similar to it. </span>
A)......they were introduced for biological control in waste treatment facilities and ponds but then they got out due to a major flood into the waterways and took over everything becoming the dominant species
