Found a similar question with the following choices:
a. living things and flowing water
b. climate and soil properties
c. physical setting and biological community
d. climate and landscape features
In a watershed system, the two main parts are the A. LIVING THINGS AND FLOWING WATER
A balance of organic and inorganic materials
As long as you are referring to the green plants aka producers of the food chain/web.
C hope it helps you. Thanks and have a great day
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