They are too weak and small to fight against the current.
Plankton
Plankton
Plankton
Organisms that drift with the ocean's currents include plankton, jellyfish, and larvae of marine organisms. These organisms rely on ocean currents for transportation, dispersal, and feeding opportunities as they move through the water column.
The ocean sunfish, Mola mola, is not a plankton. Its a nekton which means it has the ability to swim and direct itself through waters. It can decide where to go and can fight against some ocean currents. Plankton cannot do this, they drift along with the currents.
The term "plankton" refers to organisms that drift with the ocean's currents. Although some krill can swim and would thus be classed as "nekton," since they can move independently of the currents, most are considered plankton.
Plankton is the mass of mostly microscopic organisms that float or drift freely in freshwater and marine environments and Nekton are all organisms the swim actively in open water, independent of currents.
Most drift.
Plankton are tiny organisms that drift in water and form the base of the marine food chain. They produce a significant amount of Earth's oxygen through photosynthesis. Plankton populations are affected by factors such as temperature, nutrient availability, and ocean currents.
Plankton.
Plankton.
Plankton.