Ahmed makes a venn diagram to compare active transport and passive transport across the cell membrane. which label belongs in the region marked x?
uses energy to work
moves from high concentration to low concentration
moves across the cell membrane
is a form of diffusion

You did not provide the Venn Diagram but maybe this would help you out.

There are ways molecules move in and out of the cell membrane and they can be categorized as Passive or Active transport.

Here are some descriptions of passive transport, active transport, and both.

Active Transport                 Both                        Passive Transport

-Uses energy                 -Moves across            - form of diffusion

-Moves from low            cell membrane         -   Moves from high

to high concentration                                   to low concentration

Hopefully, this will help you fill in your Venn Diagram

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.