Literally thousands of species of each. Try to be more specific.
marine organisms
arthropods
animals,plants that live in the ocean
marine organisms
no they usually do not live in ocean not rivers!
i think krill eat plants in the ocean
there body surface
Plants and animals need different things because they have different needs. Plants need sunlight because they make their own food and animals need plants.
yes because a river is like a smaller section of the ocean..its the same thing
Animals and plants that live on the oceam bottom are called benthos. they are also normally dead people
Yes, plants and animals live in perfect harmony because the animals eat the plants to suvive (some do) and the plants give off O2 so that the animals can breathe; while the animal help the plants by transferring the seeds to different parts of wherever they live.
because river ecosystems and ocean ecosystems are way different so they could not survive in the wild(in this case the ocean) hope this helped at least a bit.