Question

it is around 10.5. that is more basic than baking soda and almost as alkaline as ammonia and bleach. this alkalinity is due to high concentrations of a chemical called natron. natron is a combination of sodium carbonate and naturally occurring baking soda. sodium carbonate is the substance that the ancient egyptians used to dry out mummies! contact with the lake water can cause chemical burns to many animals or people. however, as in many harsh natural conditions, life has found a way to exist in lake natron. in fact, the existence of one species explains why the lake is red. salt - loving red algae thrive in the lake. the salty water is not the only reason why this specific type of algae does well; the algae blooms best when the lake temperature reaches 140° fahrenheit (60° celsius). the hotter lake natron gets, the redder it becomes. a toxic type of bacteria exists in the algae blooms, and for most animals, when they eat it, they become very sick. a species of flamingo has adapted to the unusual lake conditions, too. these smaller flamingos have thick skin on their legs that does not get burned in the waters of lake natron. the flamingos get their pink coloration from eating lots of the red algae. which statement best supports the authors claim that people should not drink the water of lake natron? o the part of the desert where lake natron sits is lucky to get 15 1/2 inches (400 mm) of rain per year. o this term means that its ph level is higher than a neutral 7 - it is around 10.5. o however, as in many harsh natural conditions, life has found a way to exist in lake natron. o this species of tilapia has a higher internal ph than most fish, and they produce an enzyme that enables them to convert the alkaline water into waste.

Explanation:

The high pH level (around 10.5) of Lake Natron's water indicates its high alkalinity, which can cause chemical burns and is harmful for consumption. Other statements are about rainfall, life - forms adaptation, etc. and not directly related to water being unfit for drinking.

Answer:

"The term means that its pH level is higher than a neutral 7—it is around 10.5."