Answer:
this doesnt make sence ezxplain the subject
Explanation:
Answer:functional group (top row); sources in nature (bottom row)
Explanation:
Answer: 2738
Explaining: you gotta add
C. a plane for forming a scientific hypotheses
Answer:
when silver articles exposed to air silver racts with Sulphur present in the atmosphere and form a black layer of silver sulphide on the surface. copper articles get tarnished by reacting with air and water. due to this, a layer is formed over copper vessels.
