In noting that our world is "differentiated", we mean that:
a. the density of its materials decreases as you go downward toward the core.
b. the Earth has evolved in a different pattern than any other planet.
c. the Earth's magnetic field is different now in polarity than it was 700,000 years ago.
d. the iron and nickel core is denser than the silicate mantle and crust.
e. radioactive heating in the core is at a slower pace than when the Earth was new.