- The decrease of something required by an organism has a negative impact on that organism 's survival / that organism 's ability
- If there is a loss of something then that something decreases
- Hence, a loss of something required by an organism has a negative impact on that organism's survival

- A loss of something required by an organism has a negative impact on that organism's survival
- A plants / living things require water for survival / to grow
- Therefore, a loss of water has a negative impact on a plant's survival

- A loss of water has a negative impact on a plant's survival
- Decreasing something negative has a positive impact on a thing
- So, decreasing water loss has a positive impact on a plant's survival

- Decreasing water loss has a positive impact on a plant's survival
- Stomata closing reduces water loss
- So, stomata has a positive impact on plants by reducing water loss

Therefore, stomata has a positive impact on plants by reducing water loss
Question
When a plant wilts, the stomata close. How does this help the plant?

Context
- Decreasing something negative has a positive impact on a thing 
- The decrease of something required by an organism has a negative impact on that organism 's survival / that organism 's ability 
- If there is a loss of something then that something decreases 
- A plants / living things require water for survival / to grow 
- Stomata closing reduces water loss