HomeEveryday Science MCQsThe principal constituent of the atmosphere of the Earth is? 605. The principal constituent of the atmosphere of the Earth is?By Admin / September 17, 2025 A. Oxygen B. Carbon C. Hydrogen D. Nitrogen ✅ The correct answer is option D.
1. Which of the following does not pollute the air? Leave a Comment / Everyday Science MCQs / By Admin
2. Which of the following planets have the longest day? Leave a Comment / Everyday Science MCQs / By Admin