Answer:
Every nation has its own natural resourse that has abundant and theres other that lack so the countries will trade they abundant for the ones they dont have.
Explanation:
These animals were preyed upon by equally large carnivores such as saber toothed cats, cave bears and dire wolves.
Btw it's (QUATERNARY) *
All of the above
In the oxygen found in the molecules in the bonds between the atoms as chemical energy
