Final answer:
Today's maritime services include global shipping, ballast water management, and the academic analysis of maritime history, particularly in understanding species distribution and biological invasions.
Step-by-step explanation:
Three maritime services that we have today include shipping, ballast water management, and maritime history analysis in terms of biological invasions. Shipping is fundamental for global trade, connecting nations and allowing for the exchange of goods across vast geographical distances. Ballast water management is crucial to prevent biological invasions through the water transferred by ships, which can introduce non-native species to new environments. The study of maritime history is essential to understand the historical patterns of species distribution and the consequences of past shipping routes on present-day biodiversity.