Psoriasis is a disease that causes a red rash on the skin. which body system does psoriasis affect

Psoriasis affects The Integumentary System.

It affects the outside of the knees,elbows,or scalp

The micro-organisms which convert the dead plants and animals to humus are known as decomposers. Examples: Fungi and Bacteria. Decomposers recycle and convert the dead matter into humus which mixes with forest soil and provides necessary nutrients to plants.