Question

what is an effective way to sterilize or kill the bacteria in water so it is drinkable for humans?
a freeze the water
b boil the water
c filter the water
d stir the water rapidly

Explanation:

To determine the effective way to sterilize water for drinking:

• Option a: Freezing water doesn't kill bacteria; it just slows their growth.
• Option b: Boiling water (heating to 100°C) kills most bacteria, viruses, and parasites, making it safe to drink.
• Option c: Filtering removes impurities but may not kill bacteria (depends on filter type, but it's not sterilization).
• Option d: Stirring rapidly doesn't kill bacteria.

Answer:

b. Boil the water