Question

what are pebbles made of organic matter.
Means made by living organisms .​

Answer 1

Answer:

I don't think pebbles are made by living organisms

Answer 2

Organic matter is constructed from cellulose, tannin, cutin, and lignin and various proteins, lipids and sugars. These are all based on chains of carbon molecules which mean that a measure of soil organic carbon can give an indirect measure of soil organic matter.

Hope its helpful.