3 Work in groups and make a poster together with the topic “Let’s save water together!” to encourage your classmates to take action to protect the water on Earth.

Since this is an English interdisciplinary learning task, not a math problem, but as per the requirement to provide an answer in the format, here's a structured response for the poster content:
Poster Content:
1. Title: Let’s Save Water Together!
2. Slogan: Every Drop Counts! Start Saving Today!
3. Facts:
Only 1% of Earth’s water is fresh and available for use.
Many regions face severe water shortages.
4. Tips for Saving Water:
Turn off the tap while brushing teeth.
Fix leaky faucets promptly.
Take shorter showers.
Collect rainwater for plants.
5. Call to Action:
Encourage classmates to spread awareness.
Organize a water-saving campaign at school.
6. Visuals: Simple drawings of a dripping tap (with "Fix it!") and a hand under a running tap (with "Turn off!").
7. Conclusion: Together, we can make a difference. Save water, save life!