Elements [or radicals] with valency one are monovalent, those with valency two are divalent, and those with valency three are trivalent.
...
What is the Valency of an Element / Radical?
Valency Divalent [2]
Element / Radical Oxide [Oxygen]
Symbol O
Ion O2-
Answer:
Antibiotic resistance occurs when bacteria change in response to the use of these medicines. Bacteria, not humans or animals, become antibiotic-resistant. These bacteria may infect humans and animals, and the infections they cause are harder to treat than those caused by non-resistant bacteria.
your welcome ;)
Explanation:
Prokaryotes and virus don't have a nucleus, eukaryotespecially have a nucleus. Viruses can't replicate without a host cell that is eukaryotic or prokaryotic
