Regarding pathogens, the statement that is true is that viruses cannot reproduce on their own.
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:
<u><em>Influenza can cause an upset stomach</em></u><em>. Influenza primarily affects the respiratory system.</em>
<u><em>Pathogens affect everyone equally.</em></u><em> Each individual's immune response is different when exposed to the same pathogen.
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<u><em>Fungi are large, stoneflies organisms</em></u><em>. 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.</em>
