What does Lulu do on Saturdays?

Brief Explanation:

Step-by-step Solution:

1. Step 1: Identify the column labeled 'SAT' (Saturday).
2. Step 2: In the 'drink milk' row, there is a checkmark.
3. Step 3: In the 'play tennis' row, there is no checkmark.
4. Step 4: In the 'watch cartoons' row, there is a checkmark.
5. Step 5: In the 'eat vegetables' row, there is a checkmark.
6. Step 6: In the 'read a story' row, there is no checkmark.

Answer: On Saturdays, Lulu drinks milk, watches cartoons, and eats vegetables.