Which of the following is not associated with DNA replication? Ribosomes are synthesized/made
A double-stranded molecule unwinds
Hydrogen bonds are broken
Nitrogenous base pairs are formed
Occurs during interphase

i think it is true in my reasonment ..

the supermassive black hole is in the middle of the galaxy.

substitution is the answer in this case

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.