Answer:
All your going to do is right down what you see and what it's doing for the first question and then if you have any questions does that awnser your question?
A great amount of Antarctic animals feed on them. Whales, penguins, fish, birds, etc. They eat phytoplankton.
They are all eukaryotic orgabisns, have a wild nature, they all have a niche, etc.
Oxygen, water, some type of resources to build, and food to eat