HomeBiologyWhat was the source of hydrogen for first photosynthetic organisms? 248. What was the source of hydrogen for first photosynthetic organisms?By Admin / September 14, 2025 Water Hydrogen present in soil Hydrogen sulphate Hydrogen sulphide ✅ The correct answer is option D.
2. Which of the following statement about Homeostasis is incorrect Leave a Comment / Biology, Homeostasis MCQs / By Admin