An iceberg is floating in sea. How much of its mass will remain above the surface of water?

✅ C. Heparin

✅ D. The astronaut and the spacecraft are both in a free-failing state

✅ B. Elastic cartilage

✅ B. Bacteria

✅ B. Tooth enamel

✅ B. Selective absorption of light

✅ D. Radical substitution

✅ D. Avogadro's law