Answer:
The process of metal refining is done for the purpose of fixing the metals impurities through the reduction process. ... Metal refining produces refined metals but the main downside of this process is the production of too much waste after.
A。that is my answer. Maybe it is wrong, whatever, I just make a test
In external respiration carbon dioxide move from capillaries to alveoli, while oxygen move from alveoli to capillaries in internal respiration.
1 C. 2. b 3,A 4A hope this helpps
