I believe the answer is: d. the shell and the skeleton
The shell and skeleton in architecture would act as the main foundation that support the weight of the whole building. The strength of shell skeleton would determine whether the building would collapse during natural disaster such as earthquakes.
Answer:
Rainforest I'm pretty sure
Explanation:
This would be the Mountain range: the Himalayas.
Himalayas are hard to cross, both because there is no direct line, and one has to go around and because they are a very cold region. Because of this, they hindered contact between India and China.
You can visually see what you are looking for
