The beginning of the Phanerozoic is marked by the development of hard body parts, such as shells and bones.
Answer:
huh,? can you explain the question more please
Examples of strong acids are hydrochloric acid (HCl), perchloric acid (HClO4), nitric acid (HNO3) and sulfuric acid (H2SO4). ... For example, hydrogen chloride is a strong acid in aqueous solution, but is a weak acid when dissolved in glacial acetic acid.
D
Its D i think because it doesnt refer to any other things