Answer:
B
Explanation:
because it talks about technology if it said about naturally than u would mention A but in this case it is B.
hope this make sense :)
Located in the linings of the digestive system, ....
Cephalochordata is the subphylum that retains all chordate characteristics, even in the adult forms.
I’m not sure but I think nitrogen. I’m guessing.
The dermis is the skin area along a central nerve pathway