Yes or no. Does the water in marine ecosystems have a high level of salinity?
Yes
10
Fill in the blank. Light can only penetrate to _____ metres deep in water in marine ecosystems. A. 100 B. 300 C. 200
200 metres
15
What are the three zones in the marine ecosystem?
coastal zone, middle zone, deepest zone
15
Which zone is it? This zone extends from the land to where sunlight penetrates the water. Organisms that swim or that are moved by water currents live here.
Coastal zone
20
Which zone is it? This zone is between 200 metres and 1000 metres deep. There is very little light so photosynthesis is not possible. Many animals live here.
Middle zone
15
Which zone is it? This zone extends from 1000 metres deep to the bottom of the ocean floor. There is no light here. Fish in this zone feed on the remains of organisms that fall from above.
