Passive transport coloring worksheet illustrating how molecules move across the cell membrane.

Now I can see the molecules inside the cell (bottom section) more clearly. Let me analyze what I'm seeing:

- There are some water molecules (small circles) inside the cell, but fewer than outside.
- There is one carbon dioxide molecule (larger circle) inside the cell, which appears to be more concentrated inside than outside.
- There are a few sugar molecules (pentagons) and ions (diamonds) inside the cell, but significantly fewer than outside.

Based on this analysis, I can determine the direction of movement for each molecule type:

1. Water molecules (light blue circles): More outside than inside → Move into the cell (downward)
2. Carbon dioxide (orange circles): More inside than outside → Move out of the cell (upward)
3. Sugar molecules (pink pentagons): More outside than inside → Move into the cell (downward)
4. Ions (red diamonds): More outside than inside → Move into the cell (downward)

The proteins (purple and green shapes) are embedded in the membrane and serve as channels for passive transport, but they don't move across the membrane themselves.

For the coloring part:
- Hydrophilic heads should be colored dark blue
- Hydrophobic tails should be colored yellow
- Water molecules should be colored light blue
- Carbon dioxide should be colored orange
- Sugar molecules should be colored pink
- Ions should be colored red
- Proteins should be colored purple and green

For the arrows indicating movement:
- Water: arrow pointing downward (into the cell)
- Carbon dioxide: arrow pointing upward (out of the cell)
- Sugar: arrow pointing downward (into the cell)
- Ions: arrow pointing downward (into the cell)

This completes the solution to the passive transport coloring problem. The molecules move according to their concentration gradients, from areas of higher concentration to areas of lower concentration, without requiring energy (passive transport).