Toxic substances and pathogens into two types as follows: 6.1 substance that is when breathing, swallowing, or touch. 6.2 the microorganisms that cause diseases to humans, and touch.
Toxic substances were germs Remember the birds into two types as follows: 6.1 Substances inhalation, ingestion or contact with human pathogenic microorganisms 6.2 were exposed.
Toxic substances and germs. Remember and cells into 2 types as follows.6.1 substance when breathing, swallowing, or touch.6.2 microorganisms cause disease to humans and touch.