They are both built over time
<span>The most dense part of the earth is the core (part solid part molten). The least dense is the crust. The reason for this is because when the earth first started to form, the most dense particles (Fe,Ni) started to mold together and then the lesser dense (Mg silicates) and the least dense made up the crust.</span>
Answer:
Option-E
Explanation:
The phospholipid bilayer is the layer which forms the outer membrane of the cell.
The phospholipid layer is amphipathic as it contains both the hydrophilic and hydrophobic portions.
The phospholipid is composed of the glycerol attached to phosphate groups which form head or hydrophilic region and the 3 fatty acid tails which form the hydrophobic portion.
The head or hydrophilic portion is arranged in the layer facing the outer external portions and the inside of the cytoplasm as the lipid layer exist in the bilayer.
Thus, Option-E is correct.
