C, the first two don't make sense and the last one would support the opposing view point.
Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.
Answer:
the waters acts as a solvent for chemical reactions and also helps transport dissolved compounds in and out of cells.
Answer:
The outside only looks pigmented because of the color reflecting off it, but the inside is white and unpigmented because it is reflecting all the colors. Does this help?
