Concept:Loamy soil is a balanced mixture of sand, silt, and clay, giving it both high humus content and moderate porosity.
Explanation:Loam contains a good amount of decomposed organic matter called humus, so it is fertile and rich in nutrients.
The presence of sand and silt in balanced proportions prevents the soil from being too tightly packed.
This gives loamy soil moderate porosity, meaning it can hold water and air well without becoming waterlogged.
It is neither as loose and dry as sandy soil, which has high porosity, nor as heavy and sticky as clayey soil, which has low porosity.
Because of its structure, loamy soil drains well, retains moisture, and supports healthy plant growth.
Answer:D. high humus and moderate porosity