Question

co₂ is a small, non - polar molecule. it will cross the cell membrane by
multiple choice
simple diffusion.
diffusion through a channel.
active transport.
diffusion using a pump.

Explanation:

Small, non - polar molecules like CO₂ can pass directly through the lipid bilayer of the cell membrane from an area of higher concentration to an area of lower concentration without the help of transport proteins or energy input. This is the definition of simple diffusion. Diffusion through a channel requires a protein channel, active transport requires energy, and diffusion using a pump is not a standard term for this process.

Answer:

A. simple diffusion