When one dna molecule is copied to maketwo dna molecules, the new dna containsa) 75% of the parent dna. b) 25% of the parent dna. c) 100% of the parent dna. d) none of the parent dna. e) 50% of the parent dna..

B) 100% of the parent because when DNA copies itself, everything is replicated exactly.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves