Question

(05.01 MC) Which of the following is the best example of evolution occurring? (2 points) Some of the trees in places with harsh winters lose their leaves in the fall.Strains of bacteria can become immune to antibiotics that once killed them effectively.Viruses can attack single-celled organisms as well as multicellular organisms.Lions and cows both have hair covering their bodies and give birth to live offspring

Answer 1

The best answer would be 

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.