I am an animal that can now swim against currents, but when I was little, I drifted near the sea surface and often migrated vertically to hide during the day and feed at night. Who am I?
1)I was a meroplankton and now am a nekton organism.
2)I was a holoplankton and now am a benthos organism.
3)I am a copepod.
4)I am a krill.
5) I am a dinoflagellate.