The National Oceanic and Atmospheric Administration (NOAA) put together and released an amazing photo set not long ago showing us the smallest marine creatures living in our planet's seas and oceans.
Phytoplanktons, diatoms, different types and forms of algae — they all look beautiful under the microscope. Without these tiny lifeforms, invisible for the naked eye, there would be no life in our seas. Amazing! Check them all out at the link to NOAA below.