This in-between phase of stellar nurseries and star formation in stellar evolution is when the gathered dust is still condensing to form a star.

✅ A. Selenium

✅ A. smallest particle of an element which can undergo a chemical reaction

✅ B. Stratosphere

✅ A. Stratocumulus

✅ A. Perihelion

✅ A. Blue moon

✅ D. Anemometer

✅ B. Degree of hardness of minerals