People with what blood type can give blood to anyone and are thus called universal donors?

✅ A. Gastric Juice

✅ C. Mosquito

✅ D. Equal duration of day and night

✅ D. Heat energy from the earth's interior

✅ B. 1 g/cm3

✅ C. Jupiter

✅ C. Reducing the length of the rod

✅ A. Vitamin D