Which of the following is not true concerning salt marshes?
a. historically they were drained for agriculture.
b. historically they were drained for development.
c. salt marshes are not productive habitats.
d. remaining marshes are severely degraded.

c. Salt marshes are not productive habitats.

Explanation:

In geography, a marsh is a humid ecosystem with herbaceous plants growing in the water. A marsh is different from a swamp, which is dominated by trees instead of herbaceous. The water of a marsh can be only of sea, although normally it is a mixture of marine and fresh water, denominated brackish.

C is correct          l.

maybe i can