Final answer:
Ocean acidification is evidenced by a larger concentration of carbonic acid and difficulties for species to make shells, whereas ocean warming is indicated by the expansion of ocean volume and melting of glaciers and ice caps, along with ill effects on marine organisms.
Step-by-step explanation:
To distinguish between ocean acidification and ocean warming, one must consider the evidence provided. For ocean acidification, this includes larger concentrations of carbonic acid within ocean waters due to increased absorption of carbon dioxide, which leads to difficult conditions for marine species that rely on calcium carbonate to make shells, such as mollusks and corals. Additionally, an overall growing difficulty in absorbing carbon dioxide due to saturation effects also supports the concept of ocean acidification.
As for ocean warming evidence, the expansion of ocean volume and melting of glaciers and ice caps are consistent with increases in global temperature. This thermal expansion contributes to rising sea levels. Moreover, as ocean temperatures rise, marine organisms can become more prone to illness, and drastic changes in marine ecosystems, such as shift in species distributions, are observed.