Because the two strands of a dna molecule are to each other, either one can be used as a template to reconstruct the other

COMPLIMENTARY

Explanation:

Through a process known as DNA replication, a cell is said to divide into two and each new cell receives an exact copy of the DNA. They will both have one new and one parental strands respectively.  

Since these are identical copies, they also have an exact sequence of bases properly shared equally among the new cells and that makes it easier for us to use one strand as a template to create an exact sequence of bases in the other strand. This processes is called reconstruction.  

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.

dude you should crop your image so only the question shows. but   can you explain it better