Where will oxygen deficiencies typically be found?

Oxygen deficiencies are typically found at the bottom, in low places, due to the natural behavior of gases. In areas where the air is stagnant or the terrain is depressed, the concentration of oxygen can become lower because it tends to settle into these low-lying areas. Additionally, the presence of other gases, such as carbon dioxide or methane, can displace oxygen in these spaces, further contributing to reduced oxygen levels.

Higher elevations or open areas generally have better ventilation and airflow, allowing for adequate mixing of gases and maintaining healthy oxygen levels. Well-ventilated rooms are designed to ensure a constant supply of fresh air, significantly reducing the risk of oxygen deficiency. Thus, the conditions created by being at the bottom of low places make them the most likely areas to encounter insufficient oxygen levels, which is why this answer is correct.