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☆☆☆☆☆The bacterium that cannot tolerate oxygen is Anaerobes, but there are different kinds and each has different tolerances when it comes to oxygen. Obligate Anaerobes can get killed by oxygen. Facultative anaerobes those can grow without oxygen. Aero-tolerant anaerobes they never use oxygen BUT they can tolerate it. Microaerophiles require i tiny bit of oxygen but anymore than the little bit they need and they cannot grow.
Viruses use enzymes to destroy host cells after replication is complete.
vectoring is the right answer
An electron microscope is necessary to actually see a virus.
HIV is passed through unprotected sexual intercourse, dirty needles from tattoos, drugs, etc, and transmission of bodily fluids such as through open cuts or wounds. Hepatitis is passed through dirty needles, certain immunocompromised medications for transplants or cancer, and may also be hereditary.
by blood and body fluids
Hepatitis can be passed via the fecal-oral route (eating food that has been contaminated), unprotected sexual contact, or by sharing needles. HIV can be passed by unprotected sexual contact or by sharing needles.
HIV is transferred through bodily fluids, such as blood. Hepatitis depends on the type ... Hep. A is transferred through stool, Hep. B through bodily fluids, like HIV, and Hep. C through blood, as well.
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Genus and species.
giardia
they can fix nitrogen
Antibiotics are always beneficial
pathogen
