Oceanographers use a combination of (1) instruments mounted on satellites and (2) water samples observed with microscopes to study different ocean processes. What advantage(s) does combining these two methods of observation provide oceanographers

It provides more information.

Explanation:

The main advantage of combining these two methods of observation provide oceanographers more and accurate information about the ocean and the processes occurring there. The satellite provides images of the ocean surface which contains information about different processes in ocean so the use of these two methods helps the oceanographers in gaining more information about the ocean.