The correct answer is: pathogens
Explanation:
1. Pathogens are defined as viruses, bacteria, or other microorganisms that can cause disease in a host organism.
2. These harmful agents invade the body, reproduce, and can lead to various illnesses or infections.
3. Examples of pathogens include the influenza virus, Salmonella bacteria, and the malaria parasite.
4. Teratogens are substances that can cause birth defects in unborn babies.
5. Hosts are organisms that provide a living environment for other organisms, including pathogens.
6. Parasites are organisms that live on or in a host organism and benefit at the host's expense.
7. Mutagens are substances that can cause changes in an organism's DNA, potentially leading to mutations or genetic disorders.
