What is the largest ecosystem?

I think its d Marine ecosystem

Marine ecosystems consist of oceans, coral reefs and estuaries. Currently oceans are the world's largest ecosystems and are said  to cover the shore as far as tidal waters come in.

Explanation:

Hope it helps :)

oak trees? ? what was listed

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)