Marine upwelling zones are important in the context of ecosystem productivity because they increase marine productivity through the following mediums: 1. By bringing decomposing microorganisms to the surface. 2. By bringing nutrients to the surface. 3. By bringing sub-surface organisms to the surface. Which of the above statement(s) is/are correct?

Marine upwelling zones are important in the context of ecosystem produ

1.	Marine upwelling zones are important in the context of ecosystem productivity because they increase marine productivity through the following mediums: 1. By bringing decomposing microorganisms to the surface. 2. By bringing nutrients to the surface. 3. By bringing sub-surface organisms to the surface. Which of the above statement(s) is/are correct?
A.	1 and 2
B.	only 2
C.	2 and 3
D.	only 3
Answer» D. only 3