Plankton are mostly microscopic algae and animals found throughout Earth's oceans, seas and lakes, although a few species are visible to humans. Unlike fish, plankton can't swim against the current.

The two most prominent types of plankton in the ocean are zooplankton, which are tiny animal organisms, and phytoplankton, which are plantlike. (Other forms of plankton include bacterial and fungal.

Climate change may also affect plankton numbers. As a slow-growing species that produces very few young, basking sharks are particularly vulnerable to extinction, which is why the animal is listed ...

Image caption, This is one type of plankton viewed through a microscope. In fact, many scientists believe that these tiny plants and animals are amongst the most important in our seas. They may ...

Following a Sandy Cheeks solo film, Netflix has revealed plans for a movie focused on the nefarious Plankton. In a film about this pesky villain, will his notorious schemes finally pay off or be ...

Ocean acidification strips seawater of the materials that marine animals — such as corals, plankton and shellfish — use to build their shells and skeletons. This can stunt growth or cause deformations ...