Answer:
5-8
Step-by-step explanation:
To answer the question we need to know that;
- A pH of 1-6 is said to be acid with 1-3 being strongly acidic, while a pH of 8 to 14 is said to be basic with 12-14 being strongly acidic.
- Many living organisms or life systems tend to operate at a neutral pH.
- Neutral pH is the pH of 7 or close to 7.
- In this case, the pH of between 5 and 8 is fairly neutral.
- Extreme pH such as very acidic pH and very basic pH would be hostile to body systems of most living organisms.
- Therefore, life needs to maintain an almost neutral pH of 5 to 8.