Question

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

Answer 1

organic matter, organic material, or natural organic matter refers to the large source of carbon-based ... animals and their waste products in the environment. Organic molecules can also be made by chemical reactions that don't involve life.

Answer 2

Answer:

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.

Explanation:

Hope that helps you a lot dear.