A double helix is <span>a pair of parallel helices intertwined about a common axis, especially that in the structure of the DNA molecule. or in other words a double spiral.</span>
B. law of conservation of mass
This is why the total amount of and element before and after a chemical reaction is constant.
Answer:
D. X is eukaryotic and Y is prokaryotic
Answer:
C
Explanation:
Active transport requires energy, while passive energy does not.
