The average total cost (ATC) curve of a business varies/curve with the time frame. Give some explainations and reasons for the DIFFERENCE BETWEEN SHORT AND LONG-TERM ATC CURVES and HOW FIRMS can be identified as economies of scale, constant returns of scale and diseconomies of scale.

The average total cost (ATC) curve of a business varies/curve with the
time frame. Give some explainations and reasons for the DIFFERENCE
BETWEEN SHORT AND LONG-TERM ATC CURVES and HOW FIRMS can be identified
as economies of scale, constant returns of scale and diseconomies of
scale.