Question

1. microorganisms that cause diseases are classified as ______.

organic materials
thermal pollutants
pathogens
inorganic materials

Explanation:

Pathogens are defined as microorganisms (such as bacteria, viruses, fungi) that cause disease in living organisms, which matches the description in the question. The other options do not fit: organic/inorganic materials are broad substance categories not specific to disease-causing microbes, and thermal pollutants relate to temperature-based environmental harm.

Answer:

○ pathogens