What would happen if the cell membrane were completely made of a polar
substance?
o
a. the cell would need to use more facilitated diffusion.
o
b. the cell would be unable to maintain a stable internal
environment.
o
c. the cell would not be able to produce vacuoles.
o
d. the cell would stop all substances from entering.

B. The cell would be unable to maintain a stable internal  environment.

Explanation:

If cell membrane was made up of polar substance then it would have dissolved in polar solvents like water ( universal polar solvent), and the cell would have ceased to exist.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.