Answer:
Regarding pathogens, the statement that is true is that viruses cannot reproduce on their own.
Step-by-step explanation:
Viruses are pathogenic agents not considered as living beings, since they are only constituted by genetic material surrounded by a viral capsid, besides not fulfilling vital functions.
These agents are unable to reproduce on their own, so they need to place their genetic material —DNA or RNA— inside a host cell, to modify its nuclear DNA and be able to reproduce.
The other options are not correct because:
- Influenza can cause an upset stomach. Influenza primarily affects the respiratory system.
- Pathogens affect everyone equally. Each individual's immune response is different when exposed to the same pathogen.
- Fungi are large, stoneflies organisms. The pathogenic fungi, such as Candida albicans and Trichophyton, are different from the mushrooms and fungi that can be seen in soil or decomposed organic matter.