Question

A mixture of animals dung and decaying leaves of plants and trees, added to soil to increase its fertility. A. Humus B. Microorganisms​

Answer 1

Explanation:

Manure is organic matter that is used as organic fertilizer in agriculture. ... Manures contribute to the fertility of soil by adding organic matter and nutrients, such as nitrogen, that are utilised by bacteria, fungi and other organisms in the soil.

Answer 2

Answer:

microorganism

because animals dung mixes the soil and microorganism finish this.