A) Nitrogen
B) Hydrogen
C) Argon
D) Oxygen
🧠 Explanation:
Nitrogen is the most abundant gas in Earth’s atmosphere, sustaining life. For environmental science students, this highlights atmospheric science, making it a key topic for studying chemistry, environmental science, and biology. Nitrogen drives cycles. Understanding this clarifies atmospheric roles. It’s essential for analyzing environmental science, chemistry, and biology. Studying nitrogen offers insights into how gases sustain life, crucial for environmental science, chemistry, and biology.