Soil

2. which of the following likely has the largest particle size?
subsoil
humus
topsoil
parent material

parent material

Explanation:

Parent material is the term used to describe the particles that form the soil from its horizons. This is the smallest particle found in the soil and refers to the material that the soil inherited from the rock that generated it through the weathering process. Parent material is often associated with soil classification in terms of its mineral content and the level of chemical and physical weathering it has suffered.

answer; i believe the correct answer is (a)0

bacterium is not correct