Question

1. desalinization technology helps humans by—

a. creating artificial lakes
b. making ocean water drinkable
c. predicting future droughts
d. reducing air pollution

1. air conditioning allowed large populations to grow in—

a. cold, northern regions
b. coastal wetlands
c. very hot climates
d. mountain ranges

Explanation:

Question 19 (Desalinization technology)

Desalinization technology is about removing salt from ocean water to make it drinkable. Option A is about artificial lakes, C about drought prediction, D about air pollution reduction—none relate to desalinization. Only B matches as desalinization processes (like reverse osmosis) make ocean water potable.

Air conditioning cools spaces, allowing people to live in very hot climates (e.g., desert regions or tropical areas) by mitigating heat stress. Cold northern regions (A) don't need AC for habitation growth, coastal wetlands (B) relate to water/moisture, mountain ranges (D) have other factors. AC enables habitation in very hot climates (C) by controlling temperature.

Answer:

B. Making ocean water drinkable

Question 20 (Air conditioning's impact on population growth)