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arlik [135]
2 years ago
9

37.

Biology
2 answers:
Julli [10]2 years ago
7 0

Answer:

Substrate. The substrate is the surface on which the river organisms live. It may be inorganic, consisting of geological material from the catchment area such as boulders, pebbles, gravel, sand or silt, or it may be organic, including fine particles, leaves, wood, moss and plants.

Dmitrij [34]2 years ago
4 0

Answer:

cobbles

Explanation:

bc i have a river in the back of my yard

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