Question

exploring the microscopic world of plankton
the word plankton comes from the greek word planktos, which mean
plankton dominates the well - lit surface layers of the
worlds oceans.

Explanation:

The word "plankton" is derived from the Greek word "planktos". In Greek, "planktos" means "wandering" or "drifting". This etymology is relevant as plankton are organisms that drift in water bodies.

Answer:

'wandering' or 'drifting'