Select the most appropriate option to fill in blank number 2.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. marine.
The context of the sentence refers to ocean currents being altered, which directly affects the marine ecology.
The term marine specifically refers to anything related to the sea or ocean, fitting perfectly with the idea of ocean currents altering the ecosystem.
The other options don't fit as well.