Proteins involved in facilitated diffusion are
a) carrier proteins
b) channel proteins
c) a and b
d) none of the above

The best answer is C Carrier and channel proteins are involved in facilitated diffusion.

A carrier protein is a transport protein that is specific to a particular type of ion, molecule or substance.

It is a special protein that binds to a  molecule and carries the bound molecule across the cell membrane. The protein changes its shape so that it can fit into the channels that run through the membrane and then goes through the channel with its cargo. 

A channel protein is a transport  protein on the cell membrane and acts like a pore, allowing ions and small molecules to pass through more efficiently. 

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explanation:

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.