A line of rulers that passes power from father to son is a A delta.
B. dynasty
C. reign
D. scimitar

B

Explanation:

A delta is a river opening into a ocean.

A reign is the rule of just one king

A scimitar is a stick

A dynasty is a line of rulers coming from  the sma family

Though there were positive effects, the Columbian Exchange had a long-lasting negative impact. Christopher Columbus's arrival in the Americas facilitated the exchange of plants, animals and diseases between the Old and New Worlds. For generations, Christopher Columbus was considered a hero of American history. So basically there was good and bad.