TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: What is one example of hydrogen cations?, Context: To avoid the implication of the naked "solvated proton" in solution, acidic aqueous solutions are sometimes considered to contain a less unlikely fictitious species, termed the "hydronium ion" (H3O+). However, even in this case, such solvated hydrogen cations are more realistically conceived as being organized into clusters that form species closer to H9O+4. Other oxonium ions are found when water is in acidic solution with other solvents.

SOLUTION: hydronium ion

PROBLEM: The passage lists countries that still implement corporal punishment, which type of countries are closest to Latin America?, Context: Official corporal punishment, often by caning, remains commonplace in schools in some Asian, African and Caribbean countries. For details of individual countries see School corporal punishment.

SOLUTION: Caribbean

PROBLEM: What wasn't around forever?, Context: The Mesolithic period in the Indian subcontinent was followed by the Neolithic period, when more extensive settlement of the subcontinent occurred after the end of the last Ice Age approximately 12,000 years ago. The first confirmed semipermanent settlements appeared 9,000 years ago in the Bhimbetka rock shelters in modern Madhya Pradesh, India. Early Neolithic culture in South Asia is represented by the Bhirrana findings (7500 BCE) in Haryana, India & Mehrgarh findings (7000–9000 BCE) in Balochistan, Pakistan.

SOLUTION:
semipermanent settlements