What is the element required for solar energy conversion ______?

✅ B. Sphenopsids

✅ B. John Napier

✅ C. Boron

✅ D. Sulfuric acid

✅ D. Vitamin K

✅ A. 1.3 seconds

✅ D. Nuclear reactor

✅ A.  20 Hz to 20,000 Hz.