Answer:
The correct answer is A.
Explanation:
A mutagen changes the level of mutations that occur in the DNA either by affecting it physically or chemically. This helps researchers create different organisms with altered phenotypes according to what the research needs so that the genes can be investigated further under a controlled environment.
So the answer is A.
I hope this helps.
It has a d<span>ense cluster of lymphocytes and macrophages in the medulla? Hope this helps....</span>
There are no choices but the reason why we tend to value
friends as we grow older is because these are bonds that we create on our
own. These are people who have been
there for us throughout our lives. They are our link with the outside world
since they are not our family members.
The longer we are friends with others, the deeper that bond becomes.
