Answer:
The answer is A.
Explanation:
Adaptive immunity recognizes antigens of viruses.
If you are adding something to the water the concentration of water would drop, as it would start off as 100% water but then with the addition of another substance it would change that from 100% free to x% free, due to the water dissolving the substance.
Genetic variation occurs.
Mutations are not copied over and over again.
<span>Is a group living things must be able to do all of the following except
A??</span>
