Freshwater plants grow in ponds, lakes, rivers, and streams. Most have roots which anchor them in the mud at the bottom. Their stems grow through the water and their leaves and flowers open above the water's surface.
mosses, fissidens, java ferns, and pellia
They are in fresh water. Do you think goldfish come from the ocean?
A variety of plants live in fresh water marshes. Some of these plants are arrow arum, pickerelweed, soft rush and marsh hibiscus or rose mallow.
eleodia duck weed
Cilia are not plants or animals. They are a growth on many creatures. Asking "if cilia live" is like asking if legs live.
There is no such thing as a "freshwater cow." Unless you're referring to a manatee, which can live in both fresh and salt water, in which they eat underwater plants.
they can if the ocean is fresh water
Plants get their energy from sunlight and generate food through photosynthesis (using water, carbon dioxide and energy from the sun to generate carbohydrates). Whether or not they live in fresh water has nothing to do with this, though being immersed in water like seaweed is would effect access to light.
sometimes. Some live in fresh water, and cannot live in the ocean. Some live in both.
Yes, Plankton can live on fresh OR salt water.
fresh water?
flounders live in salt water. flounders can't live in fresh water