The best answer would be
<span>Strains of bacteria can become immune to antibiotics that once killed them effectively.
Because evolution is all about how the creature adapts to the environment and how it defends itself from the dangers around it. It can learn how to prevent those terrible things to happen to them that's why the virus is a creepy and good example. </span>
A singular ,common,concrete noun; a word for a measurement.
the affirmative constructive and the negative constructive.
