The noun 'plankton' is an uncountable noun, an aggregate noun, aword representing an indefinite number of things.
Plankton is plural and its singular form is plankter. However, be aware that the word "plankton" is most often used in its plural as a collective noun.
How to make plankton in doodle god
water+bactiria=plankton ;) your welcome
Rock+Plankton
plankton: DNA+water
For a cockleshell: stone + plankton :)
rock and plankton
Plankton+ stone= shell Baceria+ water= plankton
plankton + stone
no algae does
Bacteria and water
water sunlight