Any substance that triggers an immune response is an antigen(s).
Answer:
You may not think that Fruit Flies pose a health risk but they are insects and all insects pose a health risk if they hang around long enough.
Explanation:
bring change in the genetic basis of a population
<span>The circulatory system is vital in the exchange of oxygen with the cells in the animal's body because there is no living creature that can survive without oxygen, it keeps the body active.
</span>♡♡Hope I helped!!! :)♡♡
I agreed with him for 100%
