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Marine Biology and the Ocean Sciences are diverse and inspiring. There are many pathways in, and you don't need to take linear view. See the video below for a great overview from someone who worked on Blue Planet.
More than dolphins...
This wonderful clip from the new Our Planet seriescaptures many elements of Marine Biology in 4 minutes.
Watch, listen, notice and wonder:
How are ocean upwellings and currents supporting the food chain?
Why are the lantern fish so abundant? What does this tell us about human impacts?
How do the marine megafauna interact with the fish and each other?