What material in the soil serves a similar role to that of clay because of its ion exchange capacity, ability to store water, and ability to bind particles together?

humus

Explanation:

Humus

Humus is the amorphous organic matter in the soil.

It affects the bulk density of the soil and contributes in the retension of the nutrients and moisture of the soil.

It mostly contains organic matter, and is naturally composed from dead and decaying plants and animals.

Humus is a dark color organic matter, and have many nutrients which nourishes and improves the heath of the soil.