Question

which of the following consist of organic matter only?
earthworms, sand, silt clay
weeds, flower pot, compost
dead frog, tree branch,
synthetic fertilizer
compost, lady bug,
microganisms

Explanation:

Organic matter is derived from living or once - living organisms. Compost is decomposed organic material, lady bugs are living organisms, and microorganisms are also living (organic). Earthworms are organic but sand and silt clay are inorganic. Weeds and compost are organic but flower pots (usually made of inorganic materials like ceramic or plastic) are not. Dead frog and tree branch are organic but synthetic fertilizer is inorganic.

Answer:

compost, lady bug, microorganisms