In detail why even though all cells are composed of the same basic parts, the structure of cells can be very different? ?

Firstly, there are major differences in cell structure between animal and plant cells such as how plant cells have cell walls, large central vacuoles, and a basic rectangular shape, and how animal cells are generally rounder, and have lysosomes and centrioles. However, as an embryo to a fetus, all of us develop stem cells that can be anything and eventually are specialized. This is how we have blood cells which are specifically engineered to compose the blood, and how we also have epithelial cells which compose the skin. Both of these types of animal cells look completely different, but that is because their specialization is not the same despite the fact that their basic parts can be. In order to have specialized cells, they need to adapt and develop a certain structure to function. 

A. convection currents in the mantle.is the correct answer