Because bacteria mutates that's why we have a new flu vaccine every year , because strains of DNA in the bacteria change all the time.
Mutation would be the best answer.
Natural selection is the right answer hope this helps.
Answer:
a blob to generate to another which is option A:1
hope this helps you
<span>Aquatic organisms and the physical and chemical components of their environment are inseparably inter-related and interact with other. Flow and water chemistry are the primary factors governing life in riverine habitats, and both are closely related to seasonal variations.</span>
