B
(without the control you won't know what a normal result would be without the independent variable).
Answer:
I looked it up ↘️⬇️↙️
Explanation:
scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it.
I believe the answer is B: Avoid Water Pollution.
These mechanisms together with phagocytosis, antimicrobial peptides called defensins, and the complement system. Jawed vertebrates<span>, including humans,
have even more unusual defense mechanisms, including the ability to
adapt over time to recognize specific pathogens more efficiently. This process
was got by immunity is the basis of </span>vaccination.
Because if they enter our atmosphere they can cause permanent damage