Just like humans and other animals, pathogenic bacterias also has the capability to evolve.
These pathogens usually come to life as soon as they enter a host. When you use antibiotics, the majority of them will die, but several of them could survive.
When these survivals replicate, it will creates more bacterias that has higher immune towards antibiotics compared to normal bacteria
Umm...
biology is the study of life
is this the answer you're looking for?
Answer: "alga" / "algae" ;
(or, in some cases, "cyanobacterium" / "cyanobacteria").
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<u>Note</u>: This applies to marine lichens—as well as lichens on land.
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Prokaryotic cells do not contain a nucleus or any other membrane-bound organelle. Eukaryotic cells contain membrane-bound organelles, including a nucleus. So I belive the answer is A :P Hope it helps