D. More economically developed countries
D. Cross braces this is the right answer
Answer: A. before history was written.
Explanation:
I'm not sure if you need an explanation, but prehistoric means "very old or out of date." Hope this helps, Good luck! :)
The endoplasmic reticulum aids in the production and movement of proteins and other materials through the cell.
The type of learning that involves problem-solving is called insight.
