The outer core<span> of the Earth is a fluid layer about 2,300 km thick and composed of mostly iron and nickel. It that lies above Earth's solid inner </span>core<span> and below its mantle. </span>
It’s D. multi-cellular organisms. Differentiated cells are important in a multicellular organism because they are able to preform a specialized function in the body.
1.b
2. a
3.c
4. d
5. e
6. j
7. h
8. i
9. f
10 g
