Freshwater Ecosystems

noun a semiaquatic egg-laying mammal native to Australia, with a duck-like bill and webbed feet

• The platypus is a unique mammal native to Australia.
• I saw a platypus swimming in the river yesterday!
• That platypus is one funky looking creature!
• Her new invention was like a platypus - a strange combination that somehow worked perfectly.

noun a type of green algae that forms spherical colonies

• The aegagropila is a type of algae that forms into spherical shapes.
• I found a cool aegagropila at the beach today, it looks like a green ball!
• Check out this funky looking aegagropila I picked up by the lake.
• The aegagropila represents the interconnectedness of all living organisms in the ecosystem.