Answer:
1. They keep casts to preserve the real fossils.
2. Maybe someone would steal a fossil and sell it on the dark web?
3. They keep casts to keep the real fossils in prime condition, by that I mean like undamaged.
Oxygen is the answer for this question.
Answer:
is where this is a significant amount of supply of energy to an economy that can be really dangerous to pass the maximum of the energy
