The reason Egypt and Nubia were interdependent, meaning that both countries had to rely on one another for certain resources that were needed, was because both countries needed each others help. Numbia had more trade routes than Egypt, had natural resources they were interested in, and could also help fight off any invaders of Egypt.
Im not sure but i think: D) both A and C
Answer:
Valuable is having monetary value or has emotional importance. I don't understand what you mean by "why"...
Answer:
The answer is C or D but C has more of what happened so i would pick C
Explanation:
By studying it we can tell how long life has existed in earth and how different plants and animals are related to each other.