"Natural ecosystems provide an array of basic processes that affect and support humans."
Which statement does not support this quotation?
a
Lichens and mosses living on rocks help to break the rocks down, forming soil.
b
Bacterial decay helps recycle matter.
c
Treated sewage is less damaging to the environment than untreated sewage.
d
Trees add to the amount of atmospheric oxygen.
c
Treated sewage is less damaging to the environment than untreated sewage.